https://linguistics.osu.edu/about-us/osu-dissertations-linguistics (Any fulltext)
https://linguistics.osu.edu/sites/linguistics.osu.edu/files/Kang_dissertation_1997.pdf (Any fulltext)
Kang, H.-S. (1997). Phonological variation in glides and diphthongs of Seoul Korean: its synchrony and diachrony. PhD Thesis, Ohio State Univ., Columbus.