International Conference "Mathematical Analysis and Differential Equations and Applications" - Savchuk, V. V.; Samoilenko, A. M.; Sokolenko, I. V.; Stepanets, O. I.; Савчук, В. В.; Самойленко, А. М.; Соколенко, І. В.; Степанець, О. І. (Institute of Mathematics, NAS of Ukraine, 2007)