Dung, Dao Van. “On the Stability of Conical Shells in the Theory of Elastic-Plastic Deformation Processes”. <i>Vietnam Journal of Mechanics</i> 11, no. 2 (June 30, 1989): 10–16. Accessed November 8, 2025. https://vjmech.vast.vn/vjmech/article/view/10297.