Bergström 2007, pp. 127–128, figures are from Russian archives; Russian aviation trust; Russian Central Military Archive TsAMO, Podolsk; Russian State Military Archive RGVA, Moscow; Monino Air Force Museum, Moscow..
Bergström 2007, pp. 127–128, as cifras son de arquivos rusos; Confianza da aviación rusa; Arquivo Militar Central de Rusia TsAMO, Podolsk; Arquivo Militar do Estado ruso RGVA, Moscú; Monino Air Force Museum, Moscú..