1.
Karlova OO, Mykhailyuk VV. Upper and lower Lebesgue classes of multivalued functions of two variables. Ukr. Mat. Zhurn. [Internet]. 2018Aug.25 [cited 2024Nov.21];70(8):1097-106. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1620