@ARTICLE {9501,
author={L. Gouveia and M. J. Lopes and A. F. Sousa},
doi={10.1016/j.ejor.2014.07.006},
journal={European Journal of Operational Research},
title={Single PON network design with unconstrained splitting stages},
year={2015},
month={January},
volume={240},
number={2},
pages={361-371},
ISSN={0377-2217}
}