1. Andersen, Henning. 2003. "Slavic and the Indo-European migrations". In: Henning Andersen, ed. Language contacts in prehistory. Studies in stratigraphy. Amsterdam: John Benjamins, 45-76.
2. Gamkrelidze, Tamaz V. & Vjaceslav V. Ivanov. 1984. Indoevropejskij jazyk i indoevropejcy. Rekonstrukcija i istoriko-tipologiceskij analiz prajazyka i protokul'tury, 1- 2. Tbilisi: Izdatel'stvo tbilisskogo universiteta.
3. Koivulehto, Jorma. 2000. "Finno-Ugric reflexes of North-West Indo-European and early stages of Indo-Iranian". In: Karlene Jones-Bley, Martin E. Huld, & Angela Della Volpe, eds. Proceedings of the eleventh annual UCLA Indo-European conference, Los Angeles June 4-5, 1999. (Journal of Indo-European Studies Monograph Series, 35.) Washington, D.C.: Institute for the Study of Man, 21-44.
4. Meid, Wolfgang. 1975. "Probleme der raumlichen und zeitlichen Gliederung des Indo-Germanischen". In: Helmut Rix, ed. Flexion und Wortbildung. Wiesbaden: Reichert, 204-219.