Argon-Argon ages in micas from metapelites of the Ovar-Espinho area (NW Portugal): datation of metamorphism related to the variscan D3 - Acciaioli, Maria Helena; Santos, José Francisco dos; Munhá, Jose Manuel; Cordani, Umberto G.; Onoe, Artur Takashi (International Geological Congress, 2004)