Optics and magneto-optics of coexisting localized and free holes in GaAs quantum wells - Van Der Meulen, Herko Piet; Calleja Pardo, Jose Manuel; Paaramo, JS; Calleja, JM; Friedland, KJ; Hey, R; Ploog, K (Physica E-Low-Dimensional Systems & Nanostructures, 2000)