Inoue, Fumio. “S-Shaped Curve of Phonological Standardization – Six Surveys in the Tsuruoka and Yamazoe Areas”. Slavia Centralis 3, no. 1 (October 13, 2020): 101–112. Accessed January 12, 2026. https://old.journals.um.si/index.php/slaviacentralis/article/view/651.