Huynh, Le Xuan, and Le Cong Duy. “A Formula of Evaluating Structural Safety Based on Fuzzy Set Theory”. <i>Vietnam Journal of Mechanics</i> 33, no. 3 (September 8, 2011): 162–169. Accessed January 14, 2026. https://vjes.vast.vn/vjmech/article/view/209.