This part is made of summaries of reference articles and other documents
found on the Internet. It also provides the reader with a direct link
to a version of these documents that is hosted on this website. Please
note that all credits due to authors or publishers appear on the documents.
Links to original sources are not provided here because of the impossibility
for the webmaster to maintain efficiently a high number of external
links, and because of the importance to keep a version of all the
documents during the writing of the thesis.
