Sushil Kumar, Sunit Kumar and Amit Kumar (2021) “EPQ model under imperfect production process with customer return and partial backlogging”, Malaya Journal of Matematik. India, 9(01), pp. 648–654. Available at: https://www.malayajournal.org/index.php/mjm/article/view/1104 (Accessed: 16 July 2024).