• http://bdr.parisnanterre.fr/theses/internet/2009PA100061/2009PA100061-1.pdf
• http://bdr.parisnanterre.fr/theses/internet/2009PA100061/2009PA100061-2.pdf
• http://bdr.parisnanterre.fr/theses/internet/2009PA100061/2009PA100061-3.pdf