@INPROCEEDINGS {11080,
author={C. S. R. Kaipa and A. Yakovlev and M. G. Silveirinha and S. Maslovski },
doi={},
booktitle={Metamaterials Congress},
title={Negative refraction by a two-sided mushroom structure with loaded vias},
year={2011},
month={October},
volume={1},
pages={693-695} 
}