Lavcel-Budko, Olga, Aleksandras Krylovas, and Paulius Miškinis. “Separation of the Equations of Motion in Two-Dimentional Gravitatrional Pendulums”. Lietuvos matematikos rinkinys 53, no. B (December 25, 2012): 31–36. Accessed February 23, 2026. https://www.zurnalai.vu.lt/LMR/article/view/17082.