In Piñeyro and Viera (2010) (Int. J. Prod. Econ. 124 (2), 2010, 482–488) we investigate a lot-sizing problem with different demand streams for new and remanufactured items, in which remanufactured products can be substituted by new products, but not vice versa. In this note we correct some...

We investigate a lot-sizing problem with different demand streams for new and remanufactured items, in which the demand for remanufactured items can be also satisfied by new products, but not vice versa. We provide a mathematical model for the problem and demonstrate it is NP-hard, even under...