A task force has already found that works by Max Liebermann, Henri Matisse and Carl Spitzweg were looted. Restitution agreements for the first two were signed last month.
The Culture Ministry said Wednesday that experts have established without doubt that Pissarro's "The Seine seen from the Pont-Neuf, the Louvre in the background" was also looted. It's in touch with the owner's heir, whom it didn't identify, with a view to restitution "as quickly as possible."
A Swiss museum that accepted Gurlitt's collection has promised to ensure any Nazi-looted pieces are returned to Jewish owners' heirs.