http://en.wikipedia.org/wiki/Dielectric#Some_practical_dielectrics
http://www.ieee.org/organizations/pubs/newsletters/emcs/spring00/penetrat.htm
http://adsabs.harvard.edu/abs/1986rstj.rept...80K
http://www.lessemf.com/fabric.html
http://sciencelinks.jp/j-east/article/200619/000020061906A0638584.php
http://www.google.ca/search?hl=en&q=electromagnetic+fabric+shield+&meta=
http://www.google.ca/search?hl=en&q=electromagnetic+liquid+shield&meta=
http://www.google.ca/search?hl=en&q=electromagnetic+gas+shield&meta=
http://www.google.ca/search?hl=en&q=electromagnetic+shield+copper&meta=
http://www.google.ca/search?hl=en&q=electromagnetic+shield+powder&meta=
http://www.google.ca/search?hl=en&q=electromagnetic+shield+cloth&meta=