PASSIVE MOTIONS OF VECTORS AND REPERS. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 82, n. 2, p. 135–142, 1991. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/540. Acesso em: 11 jan. 2026.