A new article to share with you other links:

Joël Dugrenot on Discogs :
https://fr.wikipedia.org/wiki/Jo%C3%ABl_Dugrenot

Joël Dugrenot on Wikipédia :
https://www.discogs.com/fr/artist/608353-Jo%C3%ABl-Dugrenot?type=Credits&filter_anv=0

Joël Dugrenot on Ciné ressources : http://www.cineressources.net/recherche_t_r.phptype=PNP&pk=86429&rech_type=E&textfield=Jo%EBl+Dugrenot&rech_mode

Joël Dugrenot in Big Bang, the progressive music magazine :
http://www.bigbangmag.com/bparutY.php