EXCHANGE SPIN WAVES AND THEIR MANIFESTATION IN TWO-MAGNON ABSORPTION AND RAMAN SCATTERING V. V. Eremenko, S. A. Zvyagin, Yu. G. Pashkevich, V. V. Pishko, V. L. Sobolev et S. A. Fedorov J. Phys. Colloques, 49 C8 (1988) C8-913-C8-914 DOI: 10.1051/jphyscol:19888415