8 . ▁ ▁R ingen , ▁Catherine ▁O . ▁and ▁Or v ok ki ▁Hein äm ä ki . ▁ 1 9 9 9 . ▁Vari ation ▁in ▁Finn ish ▁V owel ▁Harm ony : ▁An ▁O T ▁Account . ▁Natural ▁Language ▁and ▁L ingu istic ▁Theory ▁ 1 7 , ▁ 3 0 3 – 3 3 7 . ▁ ▁R ingen , ▁Catherine ▁O . ▁and ▁Mik l ós ▁Kont ra . ▁ 1 9 8 9 . ▁Hung arian ▁neutral ▁v ow els . ▁L ing ua ▁ 7 8 , ▁ 1 8 1 – 1 9 1 . ▁ ▁R ingen , ▁Catherine ▁O . ▁and ▁Robert ▁M . ▁V ago . ▁ 1 9 9 8 . ▁Hung arian ▁v owel ▁harm ony ▁in ▁Opt im ality ▁Theory . ▁Ph on ology ▁ 1 5 , ▁ 3 9 3 – 4 1 6 . ▁ ▁References ▁▁ ▁Category : L ingu ists ▁from ▁the ▁United ▁States ▁Category : L iving ▁people ▁Category : W omen ▁lingu ists ▁Category : Ind iana ▁University ▁al umn i ▁Category : Univers ity ▁of ▁Iowa ▁fac ulty ▁Category : Ph on olog ists ▁Category : 1 9 4 3 ▁birth s <0x0A> </s> ▁Northern ▁ep ile ps y ▁synd rome ▁( NE ), ▁or ▁progress ive ▁ep ile ps y ▁with ▁mental ▁ret ard ation ▁( E PM R ), ▁is ▁a ▁sub type ▁of ▁neur onal ▁c ero id ▁lip of usc inos is ▁and ▁a ▁rare ▁disease ▁that