J. H. Syafira, R. -, R. Aurachman, and S. P. Kenaka, “DETERMINATION OF INVENTORY PERIODIC REVIEW POLICY (R, s, S) USING POWER APPROXIMATION METHOD FOR MINIMIZE TOTAL INVENTORY COST IN PT. OPQ”, IJIES, vol. 3, no. 1, pp. 47–52, Jan. 2019.