AkhmetovM. U. (1993) “On the expansion of solutions to differential equations with discontinuous right-hand side in a series in initial data and parameters”, Ukrains’kyi Matematychnyi Zhurnal, 45(5), pp. 715–717. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5858 (Accessed: 24November2024).