Throughout the "Theory and teaching" section, you will find many detailed pdf documents*. These documents are free. You can save them on your computer or print them for your own personal use.
For any other purpose, copies of this material or part of this material are not allowed unless you have asked a written permission to the author (contact).

*To read these documents, Acrobat reader is required. If you don’t have it installed on your computer, you can get this free software here)