http://skiing.about.com/od/crosscountryskiing/a/crosscountry101.htm
http://telemarkracers.org/wp-content/uploads/2011/08/ski-camber-pocket1.jpg
http://fasterskier.com/article/how-its-made-base-material/
http://hypertextbook.com/facts/2007/TabraizRasul.shtml
http://e-collection.library.ethz.ch/eserv/eth:28803/eth-28803-02.pdf
http://www.kuzmin.se/imgs/fpc/shining_ss_ski01.png
http://www.omerandbobs.com/info_center/waxing_guide/waxingmain.html#waxing2
http://2.bp.blogspot.com/-3JtGe6RyLQ8/UIzoz8mHG8I/AAAAAAAAB6A/3pU8ntG6yE4/s1600/a+Swix.jpeg
Estivalet, Margaret, and Pierre Charles Brisson. The engineering of sport 7. Paris: Springer, 2008. Print.