@article{article2be2a603, title = {A langragian-based heuristic for the capacitated lot-sizing problem in parallel machines}, author = {Toledo, Franklina Maria Bragion de and Armentano, Vinícius Amaral}, year = {2006}, doi = {10.1016/j.ejor.2005.06.029}, journal = {European Journal of Operational Research} }