Kopytov, Eugene, Leonid Greenglaz, and Fedor Tissen. “Stochastic Inventory Control Model With Two Stages in Ordering Process”. Journal of Business Economics and Management 7, no. 1 (March 31, 2006): 21-24. Accessed December 4, 2024. https://jcem.vgtu.lt/index.php/JBEM/article/view/7885.