Ratković, Branislava, Dražen Popović, Gordana Radivojević, and Nenad Bjelić. “Planning Logistics Network for Recyclables Collection”. Yugoslav Journal of Operations Research 24, no. 3 (October 1, 2014): 371–381. Accessed August 25, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/419.