. . "1907" . "1988" . "RITTER, HELMUT |f [componist]" . "Ritter" . "Helmut" . "http://composers-classical-music.com/r/RitterHelmut.htm" . "RITTER, HELMUT" . "componist" . "48533" . "RITTER, HELMUT" . "RITTER, HELMUT |f [bewerker]" . "bewerker" . "gw" . "43583" . "b" .