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" ("Ushakov's Explanatory Dictionary of the Russian Language"; the dictionary makes difference between e and
2.^ Article
("Ushakov's Explanatory Dictionary of the Russian Language").
3.
4.^ Benson (1960:271)
5.^ Vasmer (1979); see the etymology of the Russian word 
at here, an online version of the Russian translation of the dictionary. (retr. 16 October 2005)
6.^ Smirnovskiy (1915:4)
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