http://cnanotech.com/

http://www.geocities.com/upwardthrust/carbon/fullerene.html

http://www.personal.rdg.ac.uk/~scsharip/tubes.htm

http://www.nanocarblab.com/

http://www.opus1.com/~mercorp/Nanotubes/Nanotubes.html

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=CARBON+NANOTUBES+CRYSTAL+MODELS