Голубятников, В.П., and В.С. Градов. “Geometry and Topology of Phase Portraits of Integrable Block-Linear Dynamical Systems”. Izvestiya of Altai State University0, no. 1(105) (March 6, 2019): 69-74. Accessed December 20, 2025. https://izvestiya.asu.ru/article/view/%282019%291-11.