Participation in the Organizing, Scientific or Program Committees:
· of the Conference on Integral Equations and Inverse Problems, Varna, Bulgaria, 1989;
· of the Workshop on Nonlinear Hyperbolic Equations, Sofia, 1991;
· of the Colloquia on Differential Equations (1990-1994) and on Numerical Analysis (1992-1994), Plovdiv, Bulgaria;
· of DESTOBIO'97 (International Conference on Deterministic and Stochastic Modeling of Biointeraction), Sofia, 1997;
· of the International Conference on Biomathematics-Bioinformatics and Applications of Functional Differential Equations, Alanya, Turkey, 1999.
· of International Conference: 2004 - Dynamical Systems and Applications, Antalya, Turkey.