Chuong, L. H., and N. Q. Dung. “OPTIMAL VOLUME DESIGN OF A WORM-GEAR DRIVE WITH A BRANCH AND BOUND METHOD”. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, vol. 10, no. 5, Oct. 2016, pp. 116-21, https://stce.vjst.net/index.php/en/article/view/303.