Dyk, S. “Palatalization of the Glide in Frisian Raising Diphthongs As a Case of Shift”. Eesti Ja Soome-Ugri Keeleteaduse Ajakiri. Journal of Estonian and Finno-Ugric Linguistics, vol. 2, no. 1, Dec. 2011, pp. 125-40, doi:10.12697/jeful.2011.2.1.08.