Комментарии:SKE 5, Martin 234, Колесникова 1972а, 77-78, АПиПЯЯ 80, 283 (confused with *ák`a), Лексика 225. Despite Poppe 95 Mong. aɣur 'steam, anger' hardly belongs here (see under *ap`i). The root should be distinguished from *ák`a, although they tend to be confused: thus, Mong. *ag 'crack' could quite possibly reflect *ák`a. Some phonetic comments: Mong. *aguji regularly < *aɣuji with velar fricative dissimilation; Korean has lost the first vowel in a long derivative (a rather frequent phenomenon).