Balto-Slavic Accentuation: Some News Travels Slowly - Scholarly article (1994) on the history of Balto-Slavic accentuation patterns, by Frederik Kortlandt. - http://www.kortlandt.nl/publications/art218e.pdf
Baltic Languages - Basic information from the online Columbia Encyclopedia, Sixth Edition (2001). - http://www.bartleby.com/65/ba/Balticla.html