Christov, Christo. “A First-Order in Thickness Model for Flexural Deformations of Geometrically Non-Linear Shells”. Ann. Sofia Univ. Fac. Math. and Inf. 89 (December 12, 1997): 129–140. Accessed November 21, 2024. https://stipendii.uni-sofia.bg/index.php/fmi/article/view/362.