The Slavic word četa, which is found in modern Slavic languages with the meanings 'pair', 'band', 'troop', is shown to originate in PIE *kwet-, the root that underlies the PIE word for 'four'; the Slavic meaning 'pair' suggests that the root may go back to an earlier pre-PIE meaning 'two', cf. Hungarian két, Finnish kaksi.
- Proto-Slavic language,
- Proto-Indo-European language,
- language contact,
- Nostratic hypothesis,
- comparative linguistics
Available at: http://works.bepress.com/marc_l_greenberg/19/