Huang Y-F, Chou C-L, Liao J-J. An EPQ model under cash discount and permissible delay in payments derived without derivatives. YUJOR [Internet]. 2007 Sep. 1 [cited 2025 Aug. 25];17(2):177-93. Available from: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/222