CREDITS

This project has been possible thanks to a 5-month-permit awarded by the Catalan Education Authority (D.O.G.C. no. 4471 – 16.09.2005)

It is aimed to supply pedagogical support to teachers and students. Therefore, any commercial and/or lucrative use of this material is completely forbidden.

All the material has been prepared by the author, except for the texts and images which have been taken directly from the Internet. In these cases, the original source has been mentioned. If somebody considers his right to intellectual property has been damaged or altered, I would much appreciate to be sent a message and the material will automatically be removed from the webpage.