ELECTRON SPIN-LATTICE RELAXATION : A TOOL FOR THE INVESTIGATION OF PARAMAGNETIC CENTERS IN AMORPHOUS SEMI-CONDUCTORS A. Deville, B. Gaillard, C. Blanchard et J. Livage J. Phys. Colloques, 42 C4 (1981) C4-1001-C4-1004 DOI: 10.1051/jphyscol:19814218