DRAGANOVA, G.; MARKOV, K. On the brittle fracture of a pin-jointed frame. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 89, p. 193–202, 1997. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/368. Acesso em: 21 nov. 2024.