IVANOVA-KARATOPRAKLIEVA, I. ON INFINITESIMAL RIGIDITY OF HYPERSURFACES IN EUCLIDEAN SPACE. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 97, p. 143–150, 2005. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/152. Acesso em: 4 dec. 2024.