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Paintings in Museums and Public Art Galleries:
J. Paul Getty Museum, Los Angeles The Banquet of Cleopatra
Kunsthistorisches Museum Databank, Vienna (in German) 
Norton Simon Museum, Pasadena, California Mercury and Herse Paris Presenting Helen at the Court of Priam
Rijksmuseum Research Database, Amsterdam (in Dutch)  3 works by Gerard Hoet online
Dulwich Picture Gallery, London, UK Apollo and Daphne
Dulwich Picture Gallery, London, UK Pan and Syrinx
Museum der Bildenden Künste, Leipzig (in German) 
Regional Art Gallery in Liberec, Czech Republic Venus and Adonis
Professional Tools:
Artprice
Pictures from Image Archives:
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
La Tribune de l'Art (in French)  L'Adoration du Veau d'Or
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