@article{article8994869d,
title   = {A lagrangian relaxation approach to a coupled lot-sizing and cutting stock problem},
author = {Gramani, M. C. N and Franca, P. M and Arenales, Marcos Nereu},
year = {2009},
doi = {10.1016/j.ijpe.2009.02.011},
journal   = {International Journal of Production Economics}
}