“The main achievements of academician N. N. Bogolyubov in the area of nonlinear mechanics (Kiev period of N. N. Bobolyubov’s work)”, НК, vol. 3, no. 2, pp. 147–153, Jun. 2000, Accessed: Jan. 22, 2026. [Online]. Available: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/105