Zernov, A.E. and Kuzina, Y.V. (2003) “Qualitative Investigation of the Singular Cauchy Problem F(t, x, x′) = 0, x(0) = 0”, Ukrains’kyi Matematychnyi Zhurnal, 55(12), pp. 1720–1723. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4033 (Accessed: 5 December 2025).