koeln,1987 koeln,1988 koeln,1989 (5) koeln,1990 (2) koeln,1991 (5) koeln,1993 (4) koeln,1994 koeln,1995 (3) koeln,1996 (2) koeln,1997 (3) koeln,1998 (4) koeln,1999 (3) koenigsberg,1937 koenigsberg,1943 koenisgberg,1927 krefeld,1972 kuenzelsau,1991 kunsthalle nuernberg,1994