Volodymyr Olexandrovych Marchenko (to his 70-th Birthday) - Berezansky , Yu. M.; Mitropolsky , Yu. O.; Ostrovsky , I. V.; Pastur , L. A.; Pogorelov О. V.; Khruslov , E. Ya. (Ukrains’kyi Matematychnyi Zhurnal, 1992)