Exceptionally, neither the AIB-WEB copyright statement available at <http://www.aib.it/su-questo-sito/dichiarazione-di-copyright-aib-web/> nor any kind of Creative Commons License applies to all articles with a link to this page.

All rights to text and images contained in the article are reserved to the author. Any kind of duplication on other sites is forbidden, as well as any kind of integral distribution through online digital communication systems and any commercial use, unless specific agreements with the author.

Reproduction and circulation in paper format or on portable digital supports (offline) for exclusive scientific, didactic or documentary use are allowed, provided that the article is not altered in any substantial way, and in particular it maintains the correct indications of date, authorship and original publication.