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Schmalstieg, W.R. 1973. A Balto-Slavic and Indo-Iranian parallel: the non-existence of shwa indogermanicum (or laryngal) in the so-called long sonants. Baltistica. 9, 1 (rugs. 1973), 7–13. DOI:https://doi.org/10.15388/baltistica.9.1.1801.