Br. Augustin-Gabriel was a Montfort Brother of St. Gabriel, and extracts of his lengthy dissertation (the first seven chapters out of seventeen) were published in the Laval journal.
Br. Augustin-Gabriel’s work on intelligible matter is cited by Paul O’Reilly, “What Is Intelligible Matter?” The Thomist: A Speculative Quarterly Review 53, no. 1 (1989): 74–90. https://doi.org/10.1353/tho.1989.0053.