@ARTICLE{Absi2009,
author={Absi, Nabil and Kedad-Sidhoum, Safia},
title = {The multi-item capacitated lot-sizing problem with safety stocks
and demand shortage costs},
journal = {Computers \& Operations Research},
year = {2009},
volume = {36},
pages = {2926--2936},
number = {11},
url = {ABSI-COR2009.pdf},
doi = {http://dx.doi.org/10.1016/j.cor.2009.01.007}
}