On the brittle fracture of a pin-jointed frame. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 89, p. 193–202, 1997. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/368. Acesso em: 11 jan. 2026.