Vandenbussche, H. (1984). [Opening of the Vowel (e) Derived From Blocked Roman (e) (latin Long-e, Short-i) in Old-french - Tentative Dating and Localization]. Folia Linguistica Historica, 5(1), 41-90. https://doi.org/10.1515/flih.1984.5.1.41 (Original work published 1984)