Kien, Nguyen Dinh, Trinh Thanh Huong, and Le Thi Ha. “A Co-Rotational Beam Element for Geometrically Nonlinear Analysis of Plane Frames”. Vietnam Journal of Mechanics 35, no. 1 (April 10, 2013): 51–65. Accessed August 17, 2022. https://vjs.ac.vn/index.php/vjmech/article/view/2892.