TICS

https://docs.google.com/file/d/0BxQ-npmfSbJWRldIX09Ucmg2ajA/edit?usp=sharing
https://docs.google.com/file/d/0BxQ-npmfSbJWYXZqTDdndXZWTzg/edit?usp=sharing
http://www.injuve.es/sites/default/files/2012/46/publicaciones/Revista98_9.pdf
https://docs.google.com/file/d/0BxQ-npmfSbJWeDgtM0RUcS1kTk0/edit?usp=sharing
 http://www.ingentaconnect.com/content/fias/edp/2011/00000032/00000001/art00007?token=004b178075e41887b76504c48663c2550236e6c2a31422d2c6a332b257d7241255e4e6b6331