ShchegolevS. A. (1998) “On one class of solutions of a countable quasilinear system of differential equations with slowly varying parameters”, Ukrains’kyi Matematychnyi Zhurnal, 50(8), pp. 1121–1128. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4861 (Accessed: 24November2024).