(1)
Lavcel-Budko, O. .; Krylovas, A. .; Miškinis, P. . Separation of the Equations of Motion in Two-Dimentional Gravitatrional Pendulums. LMR 2012, 53 (B), 31–36. https://doi.org/10.15388/LMR.B.2012.06.