1.
Kaplun YI, Samoilenko VG. On Extendability of Solutions of Differential Equations to a Singular Set. Ukr. Mat. Zhurn. [Internet]. 2003 Mar. 25 [cited 2025 Apr. 9];55(3):373-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3911