Akymenko AM, Yakovets VP. On Periodic Solutions of Degenerate Singularly Perturbed Linear Systems with Multiple Elementary Divisor. Ukr. Mat. Zhurn. [Internet]. 2002Oct.25 [cited 2024Nov.22];54(10):1403-15. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4178