BTW
I have edited a long story focused on VVKJ v. Luftwaffe + RA + MKHL in 2013. More info. and actual, corrected then written in fundamental book done by Christopher Shores, Brian Cull and Nicola Malizia, Air War for Yugoslavia, Greece and Crete, 1940-41 b (1987). Photos are rare, and good reproduced, colors nice. Combats Me 109s v Me 109s too.
Text 100% in Polish, no English on 21 pages of A-4 size.
Title:
Lotnictwo Jugosławii w wojnie kwietniowej 1941 r. (Yugoslavian Aviation in April War 1941), 34 b&w plus 5 colour drawing (including Me 109 E of VVKJ) p. 21, in: Technika Wojskowa Historia nr 3/2013, s. 16-35, http://www.magnum-x.pl/czasopismasec/twhistoria/2583
PS.
I do not supply any scans or pdf of it.