PlotnikovA. V. (2000) “Differentiation of Multivalued Mappings. $T$-Derivative”, Ukrains’kyi Matematychnyi Zhurnal, 52(8), pp. 1119-1126. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4516 (Accessed: 22November2024).