1.
Ashurov SВ. Equivalence of a part of derivatives of chains in the boundary value problems for the second-order ordinary differential equations . Ukr. Mat. Zhurn. [Internet]. 1992 Sep. 8 [cited 2025 Dec. 5];44(8):1003-11. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8028