Non-integrability of a system from the rigid body dynamics. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 109, p. 57–69, 2022. DOI: 10.60063/gsu.fmi.109.57-69. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/559. Acesso em: 14 dec. 2025.