RAMAN STUDY OF THE ANHARMONICITY AND DISORDER-INDUCED EFFECTS IN Ga1-xAlxAs B. Jusserand, J. Sapriel, F. Alexandre et P. Delpech J. Phys. Colloques, 42 C6 (1981) C6-43-C6-45 DOI: 10.1051/jphyscol:1981612