[1]
N. D. Kopachevsky, “On stability and instability of small motions of hydrodynamical systems”, MFAT, vol. 13, no. 2, pp. 152–168, Jun. 2007, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/345