Elnazarov, A.A. (1998) “A method of asymptotic expansion of an m-parameter family of solutions for a quasilinear system of differential equations”, Ukrains’kyi Matematychnyi Zhurnal, 50(3), pp. 445–450. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4947 (Accessed: 5 December 2025).