Khang, Nguyen Van, Nguyen Phong Dien, and Nguyen Thi Van Huong. “On the Compression Softening Effect of Prestressed Beams”. Vietnam Journal of Mechanics 28, no. 3 (October 1, 2006): 145–154. Accessed December 5, 2025. https://vjs.ac.vn/vjmech/article/view/5574.