LILOV, L. On the investigations of Bl. Dolapchieff in the field of analytical mechanics. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 98, p. 51–59, 2008. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/129. Acesso em: 4 dec. 2024.