Rendiyatna Ferdian, Erlina Febriani, Tika Ageng, and Obsatar Sinaga. “DYNAMIC LOT SIZING MODEL FOR RETAILERS WITH MULTI SUPPLIER, QUANTITY DISCOUNTSAND CAPACITY CONSTRAINS”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 17, no. 5, Dec. 2020, pp. 1024-31, https://archives.palarch.nl/index.php/jae/article/view/2949.