@ARTICLE {17742,
author={M. G. Silveirinha},
doi={10.1103/PhysRevB.93.075110},
journal={Physical Review B - Condensed Matter and Materials Physics},
title={Z_2 Topological Index for Continuous Photonic Materials},
year={2016},
month={January},
volume={93},
number={075110},
pages={1-16},
ISSN={1098-0121}
}