This article can be found on my homepage
www.yogysoft.de. It is scanned into a pdf-file.
It was published in the German Democratic Republic in 1977, so while reading please exchange "faschistische" with "deutsche"
. Also, some figures may be influenced politically a bit, but nevertheless the informations are valuable imho. The author Olaf Groehler is quite an accepted capacity in air-war-history, and had access to various soviet sources.
Even for people who do not understand german, some interesting tables are included.