All Union Scool on Function Theory, Kemerovo, Russia, 1983, Saratov 3-th Winter Scool on Function Theory, Saratov, Russia, 1986.
International Workshop on Multivariate Approximation and Interpolation, Duisburg, 1989.
International Conference on Open Problems in Approx. Theory, Voneshta Voda, Bulgaria, 1993.
International Congress of Mathematicians, Zurich, Switzerland, 1994.
International conference 'Harmonic analysis and approximatons' Nor Amberd, Armenia (1998, 2001, )
International Conference 'Mathematics in Armenia, Advances and Perspectives', Tsahkadzor, ARMENIA, September 30 - October 7, 2003.
International Conference 'Approximation and Probability', Bedlewo, Poland, 20-24 September, 2004.
International conference 'Harmonic analysis and approximatons' Thaghkadzor, Armenia (2003, 2008, )