Aydemir, E., Bedir, F., Ozdemir, G. and Eroglu, A. 2014. An EPQ model with imperfect items using interval grey numbers. An International Journal of Optimization and Control: Theories & Applications (IJOCTA). 5, 1 (Oct. 2014), 21–32. DOI:https://doi.org/10.11121/ijocta.01.2015.00204.