The, Vu Van. “Lower Bound on the Small Displacements of Impulsively Loaded Rigid-Plastically Anisotropic Structures”. Vietnam Journal of Mechanics 5, no. 3 (September 30, 1983): 25–32. Accessed May 5, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/10435.