Subpicosecond excitonic optical nonlinearities in quantum wells M. Joffre, D. Hulin, A. Migus, A. Mysyrowicz et A. Antonetti Rev. Phys. Appl. (Paris), 22 12 (1987) 1705-1709 DOI: 10.1051/rphysap:0198700220120170500