Aydemir, Erdal, Fevzi Bedir, Gultekin Ozdemir, and Abdullah Eroglu. 2014. “An EPQ Model With Imperfect Items Using Interval Grey Numbers”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 5 (1):21-32. https://doi.org/10.11121/ijocta.01.2015.00204.