VityukA. N. “On the Existence of Solutions for a Differential Inclusion of Fractional Order With Upper-Semicontinuous Right-Hand Side”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 11 (November 25, 1999): 1562–1565. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4757.