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http://www.nature.com/nphoton/journal/v1/n1/full/nphoton.2006.52.html

http://www.chm.bris.ac.uk/~chjpr/Research/WGM.htm

http://www.astro.cardiff.ac.uk/groups/optoelec/?page=whisper

http://hu.cnsi.ucsb.edu/research/nitride_processing/index.php

http://www.nature.com/nature/journal/v424/n6950/full/nature01939.html

http://www.nature.com/nphoton/journal/v1/n8/full/nphoton.2007.141.html

http://iopscience.iop.org/0268-1242/21/3/L01/pdf?ejredirect=.iopscience