An (s,Q) inventory model with remanufacturing and disposal

In this paper the authors analyse an (S,Q) inventory model in which used products can be remanufactured to new ones. They develop two approximations for the average costs and compare their performance with that of an approximation suggested by Muckstandt and Isaac. Next the authors extend the model with the option to dispose returned policies and present a heuristic optimization procedure which is checked with full enumeration.