Evtukhov, V. M. “Asymptotic Representations for Solutions of One Class of Systems of Quasilinear Differential Equations”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 12 (December 25, 2003): 1658-1668. Accessed May 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4028.