Molnár, Ferenc A., and Béla Hollósy, editors. On the History of Word-Final Vowels in Permian Languages. Vol. Vol. 5., SZTE BTK Institute of Hungarian Language and Literature University of Szeged, 1974, https://ebook.ek.szte.hu/index.php/btk-magyarnyelviirodalmi-intezet/catalog/book/173.