KarlovaO. O. and MykhailyukV. V. (2018) “Upper and lower Lebesgue classes of multivalued functions of two variables”, Ukrains’kyi Matematychnyi Zhurnal, 70(8), pp. 1097-1106. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1620 (Accessed: 27September2024).