Beekes R.S.P. Roots with nasal infix in Pokorny

Amsterdamer Beiträge zur älteren Germanistik. — 2000. — Vol. 54 ( = Language Contact: Substratum, Superstratum, Adstratum in Germanic Languages, ed. by Dirk Boutkan and Arend Quak). — P. 3-23.This paper examines IE roots that show variants with and without an internal nasal (CeC ~ CeNC); it is argued that "prenasalized" forms - mostly reflected in Germanic - represent loanwords from a substratum language.