Hi Santiago,
We can add two useful info :
-the very good site did with primary archives on GC III/6 by F.-X. bibert :
https://www.bibert.fr/Joseph_Bibert_...LE%20GLOAN.htm
-the French magazine Fana de l'aviation has published a long bio in the issues 604,603 and 602 of early 2020
http://www.aerostories.org/~aerobiblio/article6444.html
http://www.aerostories.org/~aerobiblio/article6413.html
http://www.aerostories.org/~aerobiblio/article6390.html
Bertrand