https://books.google.fr/books?id=lCYkZS0TtRcC&printsec=frontcover&dq=Jean-Marie+Vaysse&hl=fr&sa=X&ei=LLelVNPjIIut7Abu0YCgDg&ved=0CCQQ6AEwAQ#v=onepage&q=Jean-Marie%20Vaysse&f=false
https://books.google.fr/books?id=AEVISnVHc9EC&printsec=frontcover&dq=Jean-Marie+Vaysse&hl=fr&sa=X&ei=LLelVNPjIIut7Abu0YCgDg&ved=0CDMQ6AEwBA#v=onepage&q=Jean-Marie%20Vaysse&f=false
https://books.google.fr/books?id=AEVISnVHc9EC&printsec=frontcover&dq=Jean-Marie+Vaysse&hl=fr&sa=X&ei=LLelVNPjIIut7Abu0YCgDg&ved=0CDMQ6AEwBA#v=onepage&q=Jean-Marie%20Vaysse&f=false