PARIS — Following on the heels of the Jean Dupuy and Robert Filliou gallery exhibitions, a third radical Fluxus-related artist is receiving a museum-quality gallery show in Paris: Wolf Vostell. Vostell was a German who, as an art student in Paris, was co-initiator of the European wing of the Fluxus art movement in the late 1950s and founder of the European Happening scene based in Cologne.