@article {178,
	title = {Geometry-invariant resonant cavities},
	journal = {Nature Communications},
	volume = {7},
	year = {2016},
	month = {03/2016},
	pages = {10989},
	doi = {10.1038/ncomms10989},
	url = {http://www.nature.com/doifinder/10.1038/ncomms10989},
	author = {Liberal, I. and Mahmoud, A. M. and Engheta, N.}
}
