VIDEOS TEORIA DEL DESLIZAMIENTO

http://www.youtube.com/watch?v=3q_PduV0XpE
http://www.youtube.com/watch?v=U2TSaz8-yNQ&NR=1
http://www.youtube.com/watch#!v=WRxsOMenNQM&feature=related
http://www.youtube.com/watch?v=0kFmbrRJq4w