OBSERVATION OF OPTICAL NONLINEARITY DUE TO BAND-GAP RENORMALIZATION IN QUASI-TWO-DIMENSIONAL STRUCTURES J.A. LEVENSON, I.I. ABRAM, R. RAJ and G. DOLIQUE J. Phys. Colloques, 49 C2 (1988) C2-251-C2-254 DOI: 10.1051/jphyscol:1988259