@ARTICLE {33678,
author={A. S. Santos and J.  Moura and J. Xavier},
doi={10.1109/TNSE.2015.2406252},
journal={IEEE Transactions on Network Science and Engineering},
title={Bi-Virus SIS Epidemics over Networks: Qualitative Analysis},
year={2015},
month={January},
volume={2},
number={1},
pages={17-29},
ISSN={2327-4697}
}