IvanyukN. N. (1994) “Construction of asymptotic representations of solutions from the classL?? for systems of differential equations by the method of characteristic matrix functions”, Ukrains’kyi Matematychnyi Zhurnal, 46(9), pp. 1148–1155. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5631 (Accessed: 27July2024).