STRONG LIGHT-SEMICONDUCTOR INTERACTIONS IN CdS AND GaSe, AND OPTICAL BISTABILITY V. DNEPROVSKII, A. FURTICHEV, V. KLIMOV, Shen LI, E. NAZVANOVA, D. OKOROKOV and U. VANDISHEV J. Phys. Colloques, 49 C2 (1988) C2-241-C2-246 DOI: 10.1051/jphyscol:1988257