Investigation of the photoluminescence linewidth broadening in symmetric and asymmetric in 'GA''AS' / 'GA''AS' n-type 'DELTA'- doped quantum wells - Tabata, A; Ceschin, A M; Quivy, Alain André; Levine, Alexandre; Leite, J. R.; Enderlein, R; Oliveira, J. B. B.; Laureto, E; Goncalves, J L (Materials Science & Engineering B, 1995)