Photo and electroreflectance spectra from spatially inhomogeneous heterostructures calculated by means of a new method - Beliaev, D; Enderlein, R; Soares, J A N T; Scolfaro, L M R; Ceschin, A M; Quivy, Alain André; Leite, J. R. (Superlattices and Microstructures, 1994)