Buică, Adriana, and Isaac A. García. “Periodic Solutions of the Perturbed Symmetric Euler Top”. Topological Methods in Nonlinear Analysis 36, no. 1 (April 23, 2010): 91–100. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2010.029.