Bobochko, V. N. “On the Structure of Solutions of a System of Singularly Perturbed Differential Equations With Nondiagonalizable Limit Operator”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 7 (July 25, 1998): 867–876. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4867.