[Julius_Vilevahe]

http://www.virtualpilots.fi/en/hist/

plenty of (long) interviews with Finnish aces from Winter- and Continuation War.

Also, this should be interesting read for many: Messerschmitt 109 - myths, facts and the view from the cockpit http://www.virtualpilots.fi/feature/articles/109myths/
first hand information about 109 from the people who actually flew them