http://chris-intel-corner.blogspot.fr/2013/01/tank-strength-and-losses-eastern-front.html

http://chris-intel-corner.blogspot.fr/2012/07/wwii-myths-t-34-best-tank-of-war.html

http://www.operationbarbarossa.net/the-t-34-in-wwii-the-legend-vs-the-performance/