Asymptotic analysis of the general solution of a linear singularly perturbed system of higher order differential equations with degeneracies in the multidimensional case. Part 1. НК [Internet]. 2024 Sep. 29 [cited 2025 Dec. 6];27(3):389-412. Available from: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1155