The effect of arsenic on MBE-grown modulation-doped GaAs/AlGaAs heterostructures - Patricio, Michelee G.; Estacio, Elmer; Somintac, Armando; Podpod, Arnita; Dorilag, Raphael; Salvador, Arnel (Proceedings of the 20th Samahang Pisika ng Pilipinas Physics Congress, 2002)