2002-1 Erich Schmidt-Eenboom
1999-2 Erich Schmidt-Eenboom
1993-2 Erich Schmidt-Eenboom
1993-1 Erich Schmidt-Eenboom
1993-1 Erich Schmidt-Eenboom & Wolfgang R. Vogt
1992-4 Peter Krahulec & Erich Schmidt-Eenboom