DOPPLER-FREE CONJUGATE EMISSION IN RESONANT GAS MEDIA : LINESHAPE, POLARIZATION PROPERTIES AND SATURATION D. Bloch, R.K. Raj, K.S. Peng et M. Ducloy J. Phys. Colloques, 44 C2 (1983) C2-101-C2-111 DOI: 10.1051/jphyscol:1983215