@ARTICLE {850,
author={J. J. Júdice and J.  Patrício and L. Portugal and M. Resende and G. Veiga},
doi={},
journal={Computational Optimization and Applications},
title={A study of preconditioners for network interior point methods},
year={2003},
month={January},
volume={24},
number={1},
pages={5-35},
ISSN={0926-6003}
}