Sosnitskii, S. P. “On the Stability of an Equilibrium State of Gyroscopic Coupled Systems”. Ukrains’kyi Matematychnyi Zhurnal 55, no. 2 (February 25, 2003): 255-263. Accessed January 18, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/3903.