Wife of Mathuédoï I de Poher - Possible Goldmine Source

The paragraph starts by saying Mathuédoï I married one of the daughters of Alain I the Great. (Incidentally, the page show 936 as the year of Mathuédoï’s death). Joëlle Quaghebeur is cited as the source for the paragraph 2 on the French Wikipedia page for s Mathuédoï I.

https://fr.wikipedia.org/wiki/Mathuedo%C3%AF_de_Poher

Attached in sources, there’s now a review of her academically approved tome. The PDF is titled "Annales de Bretagne et des Pays de l'Ouest". I haven’t time to find if and and search it anytime soon. Thus, I post this information so anyone wishing to find and search the source may do so.

Ken