V. G. Pisarenko, “Construction of some solutions of the Couchy generalized problem for ordinary non-linear differential equations ”, Ukr. Mat. Zhurn., vol. 23, no. 4, pp. 553–559, Jun. 1971, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8592