http://www.viniciacum.fr/j_pernet_ducher_rosieriste.html
http://en.wikipedia.org/wiki/Joseph_Pernet-Ducher
http://www.countrycareroses.com/Hybridizers/Pernet%20Ducher.htm
http://www.verticille.com/spip.php?article135
http://www.verticille.com/spip.php?article8