Berezansky , Y. M., Mitropolsky , Y. O., Ostrovsky , I. V., Pastur , L. A. ., Pogorelov О. V., & Khruslov , E. Y. . (1992). Volodymyr Olexandrovych Marchenko (to his 70-th Birthday). Ukrains’kyi Matematychnyi Zhurnal, 44(8), 1113. https://umj.imath.kiev.ua/index.php/umj/article/view/8042