IMPURITY CONCENTRATION DEPENDENCE OF RAMAN-SCATTERING BY MAGNONS IN Ni DOPED RbMnF3 AND KMnF3 G. PARISOT, R. E. DIETZ, H. J. GUGGENHEIM, P. MOCH et C. DUGAUTIER J. Phys. Colloques, 32 C1 (1971) C1-803-C1-805 DOI: 10.1051/jphyscol:19711283