[1]
V. P. Yakovets, “On the structure of the general solution of a degenerate linear system of second-order differential equations”,
Ukr. Mat. Zhurn., vol. 50, no. 2, pp. 292–298, Feb. 1998, Accessed: Apr. 16, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/4962