[1]
“ON INFINITESIMAL RIGIDITY OF HYPERSURFACES IN EUCLIDEAN SPACE”, Ann. Sofia Univ. Fac. Math. and Inf., vol. 97, pp. 143–150, Dec. 2005, Accessed: Feb. 04, 2026. [Online]. Available: https://annual.uni-sofia.bg/index.php/fmi/article/view/152