Paintings in Museums and Public Art Galleries:
Von der Heydt-Museum, Wuppertal, Germany (in German) 
Commercial Galleries:
Lempertz Auction Gallery, Cologne, Germany -- Highlights from past sales
Einer und Viele (Un dans la foule), 1961
Professional Tools:
Artprice
Konrad Klapheck copyright requests handled by the Artists Rights Society.
Articles:
 Union List of Artist Names (Getty Museum)
Reference sheet with basic information about the artist and pointers to other references.
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