Willem Martens Works Online
Categorized & Annotated
Paintings in Museums and Public Art Galleries Worldwide:
 Willem Martens at the Rijksmuseum, Amsterdam
Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project
Rijksmuseum Research Database, Amsterdam (in Dutch) 
Currier Gallery of Art, New Hampshire
Art Market:
(e.g. records of past sales at auction; sites providing examples of the artist's signature)
Christie's Past Sale Archive NEW!
(database goes as far back as 1991; images go about as far back as 1999)
Sotheby's Sold Lot Archive NEW!
(database goes as far back as 1998; images where permitted by copyright go about as far back as 2001)
Pictures from Image Archives:
Willem Martens in the Art Renewal Center
Brian Yoder's Art Gallery and Critic's Corner
Additional Image Search Tools: NEW!
(SafeSearch set to "strict"; go to Advanced Search (Flickr/Google) or Preferences (Bing) to change)
Articles and Reference Sites:
Union List of Artist Names (Getty Museum) 
Reference sheet with basic information about the artist and pointers to other references.
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