Rakhmangulov, Aleksandr, Nikita Osintsev, Dmitri Muravev, and Alexander Legusov. “An Optimal Management Model for Empty Freight Railcars in Transport Nodes”. Operational Research in Engineering Sciences: Theory and Applications 2, no. 1 (April 13, 2019): 51-71. Accessed July 20, 2019. http://www.oresta.org/index.php/oresta/article/view/13.