Both NYT and WSJ have done very interesting articles about the whole saga, going into some detail on the history of the collection (at least some of which was seized by the Allies after the war and eventually given back to the senior Mr. Gurlitt):
NYT: “For Son of a Nazi-Era Dealer, a Private Life Amid a Tainted Trove of Art”
WSJ: “The Strange Tale of Nazis, Mr. Gurlitt and the Lost Masterpieces”
