http://issuu.com/fred187/docs/bf_109_vs_yak-1
Autres sources :
https://en.wikipedia.org/wiki/Messerschmitt_Bf_109_variants
https://en.wikipedia.org/wiki/Yakovlev_Yak-1
https://en.wikipedia.org/wiki/Yakovlev_Yak-3
https://en.wikipedia.org/wiki/Yakovlev_Yak-7
