PARAMETRIC EXCITATION OF SPIN-WAVES THROUGH SPIN-FLOP CRITICAL FIELD RESONANCE IN (C2H5NH3)2 CuCl4 H. Yamazaki, J. Shi et M. Mino J. Phys. Colloques, 49 C8 (1988) C8-1607-C8-1608 DOI: 10.1051/jphyscol:19888736