1.
Pafyk SP, Yakovets VP. On the structure of the general solution and conditions of solvability of the Cauchy problem for degenerate linear systems of higher-order differential equations. Ukr. Mat. Zhurn. [Internet]. 2013Feb.25 [cited 2023Jan.31];65(2):296-05. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2419