Plotkin, Ya. D., and A. F. Turbin. “Asymptotic Integration of a Singularly Perturbed Quasilinear Cauchy Problem in a Banach Space”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 8 (August 25, 1999): 1077–1086. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4698.