AN UNAMBIGUOUS METHOD OF ELECTRON DENSITY MEASUREMENT IN A SHOCK-GENERATED PLASMA, USNG A LASER INTERFEROMETER A. Lesage, J. Richou, P. Charil and M. Combier J. Phys. Colloques, 40 C7 (1979) C7-805-C7-806 DOI: 10.1051/jphyscol:19797388