Paintings in Museums and Public Art Galleries:
Louvre Museum Database, Paris
Finnish National Gallery Art Collections, Helsinki, Finland NEW!
Funen Kunstmuseum, Odense, Denmark NEW! Select the artist's name from the drop-down list and click the "search" button
Statens Museum for Kunst, Copenhagen A Girl with Fruits in a Basket, 1827
Vejle Kunstmuseum, Denmark (in Danish) 
National Art Databases and Museum Inventories:
Danish Museums Online (in Danish)  (You can switch to English by going to the very top of the site, but the viewable works are much fewer)
Joconde Database of French Museum Collections (in French) 
Pictures from Image Archives:
Constantin Hansen in the Art Renewal Center
Constantin Hansen at CGFA 
Constantin Hansen at The Athenaeum 
Aurora Boreal - Nothern Lights
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
Miscellaneous Sites:
Scandinavian Art (mostly in Danish) 
Articles and Reference Sites:
Grove Dictionary of Art Online (excerpt) 
Union List of Artist Names (Getty Museum)  Reference sheet with basic information about the artist and pointers to other references.
Wikipedia, the "Open Content" Encyclopedia Biographical info
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