V. V. . Krakhotko, . G. P. . Razmyslovich, and V. V. . Goryachkin, “Optimization of a linear dynamic system with periodic changing parameters”, Журнал Белорусского государственного университета. Математика. Информатика, no. 1, pp. 75–79, Mar. 2020, doi: 10.33581/2520-6508-2020-1-75-79.