@ARTICLE {7964,
author={P. Amaral and I. M. B. Bomze and J. J. Júdice},
doi={10.1007/s10107-013-0690-8},
journal={Mathematical Programming},
title={Copositivity and constrained fractional quadratic problems},
year={2014},
month={June},
volume={146},
number={1},
pages={325-350},
ISSN={0025-5610}
}