PROPAGATION EFFECTS AND OPTICAL NONLINEARITIES OF EXCITONS IN MULTIPLE QUANTUM-WELLS J. A. LEVENSON, R. K. RAJ, I. ABRAM, G. DOLIQUE et F. ALEXANDREJ. Phys. Colloques, 48 C5 (1987) C5-541-C5-544DOI: https://doi.org/10.1051/jphyscol:19875116