@Article{CeseRighSala08,
author = {Alberto Ceselli and G. Righini and Matteo Salani },
title = {A column generation algorithm for a vehicle routing problem with economies of scale and additional constraints},
journal = {Transportation Science},
volume = {43},
number = {1},
pages = {56-69},
doi = {10.1287/trsc.1080.0256},
year = {2009}
}