Manuals for students
The European Commission’s support for the production of this publication does not constitute an endorsement of the contents, which reflect the views only of the authors, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). This means that you are free to share, copy and redistribute the material in any medium or format, and adapt, remix, transform and build upon the material. You may do so for any purpose, even commercially. However, you must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.