Optical properties of compositionally graded InxAl1 xAs/GaAs heterostructures Yahyaoui, N. ; Aloulou, S. ; Chtourou, R. ; Sfaxi, A. ; Oueslati, M. Abstract Publication: Thin Solid Films Pub Date: February 2008 DOI: 10.1016/j.tsf.2007.03.083 Bibcode: 2008TSF...516.1604Y