Daddow, Mohammad, Xiedong Zhang, Hongsheng Qiu, Zhihua Zhang, and Yingqi Liu. “A Mathematical Model for Ballast Tamping Decision Making in Railway Tracks”. Civil Engineering Journal 6, no. 10 (October 1, 2020): 2045–2057. Accessed June 24, 2025. https://www.civilejournal.org/index.php/cej/article/view/2403.