BakS. N., and PankovA. A. “On the Dynamical Equations of a System of Linearly Coupled Nonlinear Oscillators”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 6 (June 25, 2006): 723–729. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3490.