Rowman Altamira. p. 136. ↑ FBJ Kuiper, Aryans in the Rigveda, Amsterdam/Atlanta 1991 ↑ M. Witzel underlines the prefixing nature of these words and calls them Para-Munda, a language related to but not belonging to Proto-Munda; see: Witzel, M. Substrate Languages in Old Indo-Aryan (Ṛgvedic, Middle and Late Vedic), EJVS Vol.