Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia The Scholar at the Table, 1865-67
Musée d'Orsay Collection Database, Paris NEW! Gitana prisonnière, 1898
Flemish Art Collection Database (in Dutch) 
Royal Museums of Fine Arts of Belgium Catalogue (in French)  8 works online
State Museums of Florence Digital Archive, Italy
Professional Tools:
Artprice
Pictures from Image Archives:
Wikimedia Commons Image Database 
Boston College Fine Arts Department
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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