[Sylvester Stadler]

I have the following which might be useful:

JG 27 by Werner Girbig & Hans Ring
JG 52 various volumes by Niko Fast; three volumes of the Gruppen by Bernd Barbas
KG 4 by Karl Gundelach
KG 26 by Rudi Schmidt
KG 51 by Wolfgang Dierich
KG 53 by Heinz Kiehl
KG 55 by Wolfgang Dierich
KG 100 by Ulf Balke
Das waren die deutschen Stuka-Asse, and
Das waren die deutschen Kampfflieger-Asse, both by Georg Brütting