Surface and Structural characterization of SiÂ¡-xGeX/Si alloys and multi-quantum wells Grown by Gas Source Molecular beam Epitaxy - Zou, L.-F.; Acosta-Ortíz, S.E.; Regalado, L.E.; LuXin Zou.; Sarabia-Torres, J.; .; Pérez-Herrera, G.A. (Revista Mexicana de Física, 2000)