Control Systems Department,
Technical University of Sofia, Branch Plovdiv,
25 Tsanko Dustabanov Str, 4000 Plovdiv, Bulgaria
Office: 4317
Phone: (+359) 32 659 528
E-mail: topalov@tu-plovdiv.bg
Qualification:
Dr. Andon V. Topalov received the MSc degree in Control Engineering from the Faculty of Information Systems, Technologies, and Automation at Moscow State University of Civil Engineering (MGGU) in 1979. He then received his PhD degree in Control Engineering from the Department of Automation and Remote Control at Moscow State Mining University (MGSU), Moscow, in 1984. From 1985 to 1986, he was a Research Fellow in the Research Institute for Electronic Equipment, ZZU AD, Plovdiv, Bulgaria. In 1986, he joined the Department of Control Systems, Technical University of Sofia at the Plovdiv campus, were he is presently a Full Professor. He has held long-term visiting Professor/Scholar positions at various institutions in South Korea, Turkey, Mexico, Greece,Belgium, UK, and Germany. And he has coauthored one book, edited one book, and authored or coauthored more than 80 research papers in conference proceedings and journals. His current research interests are in the fields of intelligent control and robotics.
Book chapters and journal papers
2014
K. Shiev, S. Ahmed, N. Shakev and A.V. Topalov, Trajectory Control of Manipulators Using an Adaptive Parametric Type-2 Fuzzy CMAC Friction and Disturbance Compensator , to be published as a chapter in a book M. Hadjiski, N. Kasabov, D. Filev, V. Jotsov (Eds.), 'Novel Applications of Intelligent Systems', Springer, 2014.
2012
K. Shiev, N. Shakev, A.V. Topalov, Trajectory Tracking Control of AR. Drone Quadrotor, Complex Control Systems, Scientific Journal of the Institute of Systems Engineering and Robotics, Bulgarian Academy of Sciences, vol. 11, pp. 70-75, 2012.
N. Shakev, K. Shiev, A. Topalov, Control Approaches for Quadrotor Mini-Rotorcraft , Engineering Sciences, Scientific Journal of the Bulgarian Academy of Sciences, Year XLIX, No. 3, pp. 5- 13, 2012.
S. Ahmed, N. Shakev, A. Topalov, K. Shiev and O. Kaynak, Sliding Mode Incremental Learning Algorithm for Interval Type-2 Takagi-Sugeno-Kang Fuzzy Neural Networks, Evolving Systems, vol. 3, pp. 179-188, DOI 10.1007/s12530-012-9053-6, Springer, 2012.
2011
K. B. Shiev, N. G. Shakev, A. V. Topalov, S. A. Ahmed and O. Kaynak, An Extended Sliding Mode Learning Algorithm for Type-2 Fuzzy Neural Networks , in A. Bouchachia (Ed.): ICAIS 2011, Lecture Notes in Artificial Intelligence 6943, Springer-Verlag Berlin Heidelberg, pp. 52-63, 2011
K. B. Shiev, N. G. Shakev, A. V. Topalov, S. A. Ahmed and O. Kaynak, An Extended Sliding Mode Learning Algorithm for Type-2 Fuzzy Neural Networks , in A. Bouchachia (Ed.): ICAIS 2011, Lecture Notes in Artificial Intelligence 6943, Springer-Verlag Berlin Heidelberg, pp. 52-63, 2011.
N. G. Shakev, A. V. Topalov, O. Kaynak and K. B. Shiev, Comparative Results on Stabilization of the Quad-rotor Rotorcraft Using Bounded Feedback Controllers , Journal of Intelligent and Robotic Systems, vol. 65, pp. 389-408, DOI 10.1007/s10846-011-8583-3, Springer, 2012.
A. V. Topalov, A New Stable On-line Learning Algorithm for Takagi-Sugeno-Kang Type Neuro-Fuzzy Networks , published in Comptes rendus de l Academie bulgare des Sciennces, (Sciences et Ingenierie, Automatique et informatique), Tome 64, No 10, pp. 1489-1498, 2011.
A. V. Topalov, Y. Oniz, E. Kayacan and O. Kaynak, Neuro-Fuzzy Control of Antilock Braking System Using Sliding Mode Incremental Learning Algorithm, Neurocomputing, 74, pp.1883-1893, Elsevier, 2011.
A. V. Topalov, M. G. Petrov, N. G. Shakev and A. M. Taneva, Application of the Artificial Intelligence Methods in Control Systems. Part. 2. Application of Neural Networks , textbook published by Technical University of Sofia publishing house, 2011, 162 p. (in Bulgarian)
2009
M. G. Petrov, A. V. Topalov, A. M. Taneva and N. G. Shakev, Application of the Artificial Intelligence Methods in Control Systems. Part. 1. Fuzzy Logic and Control , textbook published by Technical University of Sofia publishing house, 2009, 160 p., ISBN: 978-954-438-801-0 (in Bulgarian).
2007
A.V. Topalov, O. Kaynak and G. Aydin, Neuro-Adaptive Sliding-Mode Tracking Control of Robot Manipulators , International Journal of Adaptive Control and Signal Processing, vol. 21, issue 8-9, pp. 674-691, 2007.
2006
A.V. Topalov, G.L. Cascella, V. Giordano, F. Cupertino and O. Kaynak, Sliding Mode Neuro-Adaptive Control of Electric Drives , IEEE Transactions on Industrial Electronics, vol. 54, issue 1, pp. 671-679, 2007.
A.V. Topalov, S. Ahmed, N.G. Shakev, An Algorithm Based on Sliding Mode Control Theory for On-line Learning in Fuzzy-Neural Networks , Journal of the Technical University at Plovdiv, Bulgaria Fundamental Sciences and Applications , vol. 13 (4), 2006, pp. 187-198
A.V. Topalov and N.G. Shakev, Hierarchical Control System for Playing Soccer Mobile Robots, in the journal Automatica and Informatics, No.1, pp.48-50, 2006, Bulgaria, (in Bulgarian).
1986-2005
A.V. Topalov and O. Kaynak, Discrete-Time Quasi-Sliding Mode Feedback-Error- Learning Neurocontrol of a Class of Uncertain Systems , In: Gelbukh at al. (eds.): MICAI 2005: Advances in Artificial Intelligence, Lecture Notes in Artificial Intelligence 3789, pp. 1124-1133, Springer-Verlag, Berlin Heidelberg, 2005.
A.V. Topalov and O. Kaynak, Neural Network Closed-Loop Control Using Sliding Mode Feedback-Error-Learning , In: Pal et al. (eds.): Artificial Neural Networks and Neural Information Processing - ICONIP 04, Lecture Notes in Computer Science, pp. 269-274, Springer-Verlag, Berlin Heidelberg New York, 2004.
A.V. Topalov and O. Kaynak, Neural Network Modeling and Control of Cement Mills Using a Variable Structure Systems Theory Based On-line Learning Mechanism , Journal of Process Control, vol.14, pp.581-589, 2004.
N.G. Shakev, A.V. Topalov, and O. Kaynak, Sliding Mode Algorithm for Online Learning in Analog Multilayer Feedforward Neural Networks , In: Kaynak et al. (eds.): Artificial Neural Networks and Neural Information Processing - ICANN/ICONIP 2003, Lecture Notes in Computer Science, pp.1064-1072, Springer-Verlag, Berlin Heidelberg New York, 2003.
H.L. Akin, A.V. Topalov, and O. Kaynak, Cerberus 2001 Team Description , in A. Birk, S. Coradeschi, and S. Takodoro (Eds.): RoboCup 2001, Lecture Notes in Artificial Intelligence 2377, pp. 689-692, Springer-Verlag Berlin Heidelberg, 2002.
N.G. Shakev, J.K. Tombakov, I. Kalvatchev, A.V. Topalov, P.E. Pavlova, and H.L. Akin, Control System Architecture for an Autonomous Quadruped Robot , In: Philippe Bidaud and Faiz Ben Amar (eds.): 5th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, pp.867-874, John Wiley and Sons, Sept. 2002, ISBN: 186058306.
A.V. Topalov and O. Kaynak, On-Line Learning in Adaptive Neurocontrol Schemes with a Sliding Mode Algorithm, IEEE Trans. on Systems, Man and Cybernetics, Part B, v.31, no: 3, pp. 445-450, 2001.
A.V Topalov and S.G. Tzafestas, Fuzzy-Neural-Genetic Layered Multi-Agent Reactive Control of a Robotic Soccer , chapter in the book Data Mining for Design and Manufacturing: Methods and Applications , Prof. Dan Braha ed., Book Series: Massive Computing, Volume 3, Kluwer Academic Publishers, Dordrecht (ISBN 1-4020-0034-0), pp. 417-442.
A.V. Topalov, J.-H. Kim, and T.Ph. Proychev, Fuzzy-Net Control of Non-Holonomic Mobile Robot Using Evolutionary Feedback-Error-Learning , journal Robotics and Autonomous Systems (ISSN 0921-8890), Vol. 23, Issue 3, pp. 187-200, Elsevier, 1998.
A.V. Topalov, J.-H. Kim, and T. Ph. Proychev, Neuro-Genetic Adaptive Control with Application to Robot Manipulators , Journal of the Technical University Sofia, campus Plovdiv, Vol. 5 Technical Sciences, 1996, pp. 127-135.
A.V. Topalov, Development and Analysis of Parallel Algorithms for Nonlinear Filtration of Images , Journal ACMBUL Newsletter, vol.2, no.1, pp. 36-42, Dec. 1993, Bulgaria.
A.V. Topalov, T.Ph. Proychev, and D.M. Choparinov, A System for Parallel Image Processing , Journal ACMBUL Newsletter, vol.2, no.2, pp.22-23, Dec.,1992, Bulgaria.
G.E. Ivanchenko, S.L. Demidov, and A.V. Topalov, Telemetry System for Elektronika D3-28 Microcomputer with Dispersed Experimental Stations, Instruments and Experimental Techniques vol. 29 (5), part 1, pp. 1045-1049, Sept.-Oct. 1986, Plenum Publ. Corp., New York (ISSN: 0020-4412, IDS Number: H3842)
Edited books
1. Recent Advances in Mobile Robotics, Edited by Andon Venelinov Topalov, InTech, Rijeka, 2011, ISBN 978-953-307-909-7
Tutorials presented on international conferences
1. O. Kaynak and A.V. Topalov, New Stable Variable Structure Systems-based On-line Learning Algorithms for Parameter Tuning in Intelligent Systems, Tutorial presented on the IEEE International Symposium on Industrial Electronics (IEEE ISIE 2005), Dubrovnik, Croatia, 2005.
Conference papers
A.V. Topalov, N.G. Shakev and S.A. Ahmed, Redesign of an Intelligent Adaptive Control Scheme for the Cement Milling Process, published in Proc. of the 15th IFAC Workshop on International Stability, Technology and Culture, SWIIS 2013, June 6 - 8, 2013, Pristina, Kosovo, pp. 262-267.
N. Shakev, A.V. Topalov, K. Shiev, O. Kaynak, Stabilizing Multiple Sliding Surface Control of Quad-rotor Rotorcraft, published in Proc. of the 9th Asian Control Conference, ASCC 2013, June 23 - 26, 2013, Istanbul, Turkey, 978-1-4673-5769-2/13/$31.00 2013 IEEE.
S. Ahmed, K. Shiev, A.V. Topalov, N. Shakev, O. Kaynak, Sliding Mode Online Learning Algorithm for Type-2 Fuzzy CMAC Networks, to be published in Proc. of the 9th Asian Control Conference, ASCC 2013, June 23 - 26, 2013, Istanbul, Turkey, 978-1-4673-5769-2/13/$31.00 2013 IEEE.
K. Shiev, N. Shakev, A. V. Topalov and S. Ahmed, Trajectory Control of Manipulators Using Type-2 Fuzzy Neural Friction and Disturbance Compensator, Proc. of the 6th IEEE International Conference Intelligent Systems, Sofia, 2012, Bulgaria, pp. 324 - 329.
N. G. Shakev, A. V. Topalov, K. B. Shiev and H. M. Aleksiev, Hovering Control of Quad-rotor Rotorcraft Using Visual Servoing: The PVTOL Experiment, Proc. of the IFAC International Workshop DYCAF 2012, Plovdiv, 13-16 June, 2012, Bulgaria, pp. 193 - 198.
K. B. Shiev, N. G. Shakev, A. V. Topalov and P. E. Pavlova, Real-Time Stabilization and Visual Tracking Control of a Mini-Quadrotor Rotorcraft, Proc. of the International Conference Automatics and Informatics 2011, 3-7 October 2011, Sofia, Bulgaria, pp. B-169 - B-172.
N. G. Shakev, A. V. Topalov and S. M. Nikolova, Autonomous Guidance and Flight Control of a Quadrotor Mini-rotorcraft, Proc. of the International Conference Automatics and Informatics 2010, 3-7 October 2010, Sofia, Bulgaria, pp. I-213 - I-216.
A. V. Topalov, N. G. Shakev, O.Kaynak and E. Kayacan, Neuro-adaptive Approach for Controlling a Quad-rotor Helicopter Using Sliding Mode Learning Algorithm, Proc. of the IFAC International Workshop on Adaptation and Learning in Control and Signal Processing, ALCOSP - 2010, 26-28 August 2010, Antalya, Turkey
K. B. Shiev, A. V. Topalov, N. G. Shakev and S. A. Ahmed, Laboratory Stand for Rapid Prototyping of Real Time Control Systems, Proc. of International Conference Automatics and Informatics 09, pp. VI-57 - VI-60, Sofia, Bulgaria, Sept. 29 - October 4, 2009. (in Bulgarian)
N. G. Shakev, A. V. Topalov, S. M. Nikolova, and D. T. Seyzinski, Dynamic Modelling and Attitude Stabilization of a Quadrotor Miniature Helicopter, Proc. of International Conference Automatics and Informatics 09, pp. VI-61 - VI-64, Sofia, Bulgaria, Sept. 29 - October 4, 2009.
A. V. Topalov, E. Kayacan, Y. Oniz and O. Kaynak, Neuro-Fuzzy Control of Antilock Braking System Using Variable-Structure-Systems-based Learning Algorithm, Proc. of the International Conference on Adaptive and Intelligent Systems (ICAIS 2009), pp. 166-171, Klagenfurt, Austria, 24-26 Sept., 2009.
A. V. Topalov, N. G. Shakev, S. M. Nikolova, D. Seyzinski and O. Kaynak, Trajectory Control of Unmanned Aerial Vehicle Using Neural Nets with a Stable Learning Algorithm, Proc. of 17th Mediterranean Conference on Control & Automation, pp. 880 - 885, Thessaloniki, Greece, June 24-26, 2009.
A. V. Topalov, E. Kayacan, Y. Oniz and O. Kaynak, Adaptive neuro-fuzzy control with sliding mode learning algorithm: application to antilock braking system, Proc. of The Seventh Asian Control Conference (ASCC 2009), pp. 784 - 789, Hong Kong, China, August 27-29, 2009.
N. G. Shakev, A. V. Topalov and O. Kaynak, A neuro-fuzzy adaptive sliding mode controller: Application to second-order chaotic system. Proc. of 4th International IEEE Conference Intelligent Systems, pp 9-14 - 9-19, Varna, Bulgaria, Sept. 6-8, 2008.
E. Kayacan, Y. Oniz, O. Kaynak and A. V. Topalov, Adaptive control of antilock braking system using grey multilayer feedforward neural networks, Proc. of Seventh International Conference on Machine Learning and Aplications (ICLMA 08), pp. 356 - 361, San Diego, California, USA, 11-13 Dec., 2008.
A. V. Topalov, D. T. Seyzinski, S. M. Nikolova, N. G. Shakev and O. Kaynak, Neuro-adaptive Trajectory Control of Unmanned Aerial Vehicles, Proc. of Fourth Scientific Conference with International Participation
SPACE, ECOLOGY, NANOTECHNOLOGY, SAFETY (SENS 2008), pp. 45-50, Varna, Bulgaria, 4-7 June, 2008.
A.V. Topalov, O. Kaynak, N.G. Shakev and S.K. Hong, Sliding Mode Algorithm for On-line Learning in Fuzzy Rule-based Neural networks, Proc. of the 17th IFAC World Congress, pp. 12793-12798, Seoul, Korea, July 6-11, 2008.
E. Kayacan, Y. Oniz, O. Kaynak and A.V. Topalov, "Kilitlenmeyen Fren Sistemi (KFS)nin Gri Çok Katmanlı İleri Beslemeli Yapay Sinir Ağları ile Uyarlamalı Kontrolu", TOK 2008 - Otomatik Kontrol Ulusal Toplantısı, İstanbul, Türkiye, pp. 453-458, 13-15 Kasım, 2008. (in Turkish).
C.-J. Kim, M.-S. Park, A. V. Topalov, D. Chwa and S.-K. Hong, Unifying Strategies of Obstacle Avoidance and Shooting for Soccer Robot Systems, Proc. of International Conference on Control, Automation and Systems, Seoul, Rep. of Korea, Oct. 17-20, 2007, pp. 207-211.
G.L. Cascella, F. Cupertino, A.V. Topalov, O. Kaynak and V. Giordano, Adaptive Control of Electric Drives Using Sliding-Mode Learning Neural Networks, Proc. of IEEE International Symposium on Industrial Electronics (ISIE 2005), Dubrovnik, Croatia, 2005, pp. 125-130.
A.V. Topalov and O. Kaynak, Robust Neural Identification of Robotic Manipulators Using Discrete Time Adaptive Sliding Mode Learning, Proc. of IFAC World Congress, Prague, 2005, (paper code We-E16-TO/5).
A.V. Topalov and O. Kaynak, Sliding Mode Feedback-Error-Learning Neurocontrol Strategy for a Robot Manipulator, Proc. of Joint 2nd International Conference on Soft Computing and Intelligent Systems and 5th International Symposium on Advanced Intelligent Systems (SCIS&ISIS 04), Japan, 2004, pp. 124-130.
V. Giordano, A.V. Topalov, O. Kaynak, and B. Turchiano, Sliding Mode Approach for Online Neural Identification of Robotic Manipulators, Proc. of the 5th Asian Control Conference (ASCC 04), pp. 2070-2076, Australia, 2004, pp. 2070-2075.
A.V. Topalov and O. Kaynak, Neuro-Adaptive Modeling and Control of a Cement Mill Using a Sliding Mode Learning Mechanism, Proc. of 2004 IEEE International Symposium on Industrial Electronics (ISIE 04), France, 2004, pp. 225-230.
A.V. Topalov and O. Kaynak, Robust On-line Training of Multilayer Perceptrons via Direct Implementation of Variable Structure Systems Theory, Proc. of the 4th International Symposium on Advanced Intelligent systems (ISIS 2003), pp. 300-303, Jeju, South Korea, 2003.
A.V. Topalov, O. Kaynak and N.G. Shakev, Variable Structure Systems Approach for On-line Learning in Multilayer Artificial Neural Networks, Proc. of the 29th Annual Conference of the IEEE Industrial Electronics Society - IECON 03, Vol. 3, pp.2989-2994, U.S.A., Nov. 2003.
A.V. Topalov and O. Kaynak, A Sliding Mode Strategy for Adaptive Learning in Multilayer Feedforward Neural Networks with a Scalar Output, Proc. of IEEE International Conference on Systems, Man and Cybernetics - SMC 03, Vol. 2, pp. 1636-1641, Washington D.C., U.S.A., Oct. 2003.
A.V. Topalov, O. Kaynak, and N.G. Shakev, Neural Network Identification, Predictive Modeling and Control with a Sliding Mode Learning Mechanism: an Application to the Robotic Manipulators, Proc. of First International IEEE Symposium Intelligent Systems, Vol. 1, pp. 102-107, Varna, Bulgaria Sept. 2002,.
N.G. Shakev, A.V. Topalov, O. Kaynak, and H.L. Akin, Reactive-behavior Learning of Quadruped Robots Playing Soccer, Proc. of First International Conference on Mechatronics: ITM'01, pp. 149-154, Istanbul, Turkey, October 1-3, 2001.
A.V. Topalov and S.G. Tzafestas, Layered Multi-Agent Reactive-Behavior Learning in a Robotic Soccer, Proc. of the 6th IFAC Symposium on Robot Control, SYROCO'00, pp.325-330, Vienna, Sept. 2000.
A.V. Topalov and D.D. Tsankova, Goal-Directed, Collision-Free Mobile Robot Navigation and Control, Proc. of 1st IFAC Workshop on Multi-Agent Systems, pp. 31-36, Vienna, Dec. 1999.
D.D. Tsankova and A.V. Topalov, Behavior Arbitration for Autonomous Mobile Robots Using Immune Networks, Proc. of 1st IFAC Workshop on Multi-Agent Systems, pp. 25-30, Vienna, Dec. 1999.
A.V. Topalov, D.D. Tsankova, M.G. Petrov, and T.Ph. Proychev, Intelligent Sensor-Based Navigation and Control of Mobile Robot in a Partially Known Environment, Proc. of 3rd IFAC Symposium on Intelligent Autonomous Vehicles, pp. 439-444, Madrid, Spain, March 25-27, 1998.
A.V. Topalov and D.D. Tsankova, A Hybrid System for Mobile Robot Path-Planning and Control, Proc. of International Workshop on Intelligent Control, pp. 57-62, Sofia, Bulgaria, Oct. 13-15, 1997.
A.V. Topalov, D.D. Tsankova, M.G. Petrov, and T.Ph. Proychev, Intelligent Motion Planning and Control for a Simulated Mobile Robot, Proc. of 2nd IFAC Workshop on New Trends in Design of Control Systems, pp. 338-343, Smolenice, Slovakia, Sept. 1997.
M.G. Petrov, T.Ph. Proychev, and A.V. Topalov, An Adaptive Hybrid Fuzzy-Neural Controller, Proc. of 2nd IFAC Workshop on New Trends in Design of Control Systems, pp. 326-331, Smolenice, Slovakia, Sept. 1997.
A.V. Topalov, K.-Ch. Kim, J.-H. Kim, and B.-K. Lee, Fast Genetic On-Line Learning Algorithm for Neural Network and Its Application to Temperature Control, Proc. of IEEE Int. Conf. on Evolutionary Computation, pp.649-654, Nagoya, Japan, May 1996.
A.V. Topalov, J.-H. Kim, and T.Ph. Proychev, Neuro-Adaptive PID Control with Application to Robotic Manipulators, Proc. of Korean Automatic Control Conference, pp. 415-420, Seoul, South Korea, March 29-30, 1996.
A.V. Topalov, K._Ch. Kim, and J.-H. Kim, An On-line Tuned Neuro-Genetic PID-type Controller, Proc. of Korean Automatic Control Conference, March 29-30, 1996, Seoul, South Korea, pp. 195-198.
A.V. Topalov, T.Ph. Proychev, and M.G. Petrov, Expert PID Autotuning of PID Controller with Fuzzy Self-Tunning, Proc. of 3rd IFAC/IFIP Workshop Algorithms and Architectures for Real-Time Control, Ostend, Belgium, May 31-June 2,1995, pp.391-396.
A.V. Topalov, T.Ph. Proychev, and M.G. Petrov, Translation and Rotation Invariant 2D Object Recognition for Vision-Based Robot Control, Proc of IFAC Workshop on Intelligent Manufacturing Systems (IMS'95), Bucharest, Romania, Oct. 24-26, 1995, pp. 55-60.
A.V. Topalov, T.Ph. Proychev, and M.G. Petrov, Vision-Based Robot Control Using Position Invariant Neural 2D Object Recognition, Proc. of National Conf. "Avtomatika i Informatika", Nov. 7-9, 1995, Sofia, Bulgaria, pp. 11-14.
M.G. Petrov and A.V. Topalov, On Adaptive Fuzzy Control Using Neural Networks, 1st IFAC Workshop on New Trends in Design of Control Systems, Smolenice, Slovak Republic, Sept.1994, pp.144-149.
A.V. Topalov and M.G. Petrov, Some Applications of Neural Networks in Automatic Control Tasks, 1st Balkan IFAC-type Conference on Applied Automatic Systems, Ohrid, Macedonia, 1993, pp.17-18.
A.V. Topalov, G.B. Bonev, D.I. Ivanov, and D.M. Choparinov, A System for Image Acquisition and Digital Image Processing, Proc. of 5th National Conference "Control of Technological Processes" (CTP'92), Technological University of Sofia, 1992, (in Bulgarian).
A.V. Topalov, T.Ph. Proychev, and C.D. Uzunov, Comparative Analysis and Evaluation of Optical Character Recognition Methods, Proc. of 5th National Conference "Control of Technological Processes" (CTP 92), Technological University of Sofia, 1992, (in Bulgarian).
T.Ph. Proychev, A.V. Topalov, M.G. Petrov, and K.P. Kutrianski, Automated Processing of Images from Biomedical Analysis, Proc. of the 4th National Conference "Control of Technological Processes" (CTP 91), Technological University of Sofia, 1991, (in Bulgarian).
A.V. Topalov, T.Ph. Proychev, and B.N. Todorov, A System for Digital Image Processing and Analysis in Biomedical Research, Proc. of 4th National scientific session "Automation of Biotechnological Processes and Biomedical Research", Sofia, 1991, (in Bulgarian).
T.Ph. Proychev, A.V. Topalov, C.D. Uzunov, and V.M. Denisov, Classification of 2D Objects in Binary Pictures Using Second Order Histograms, Proc. of XXVI scientific session Communication, Electronic and Computer Systems 91, Technical University of Sofia, 1991, (in Bulgarian).
A.V. Topalov, T.Ph. Proychev, C.D. Uzunov, and Y.N. Matveev, Determination of Orientation of 2D Objects Using Modified Second Order Histograms, Proc. of XXVI scientific session "Communication, Electronic and Computer Systems 91", Technical University of Sofia, 1991, (in Bulgarian).
E.F. Ochin,T.Ph. Proychev, A.V. Topalov, and G.B. Bonev, Algorithms for Nonlinear Filtration of Optical Images, Proc. of International Conference "ROBCON-5", Varna, Bulgaria, 1989, pp. 258-270 (in Russian).