ISING CRITICAL BEHAVIOR IN SPIN GLASSES : Fe0.25Zn0.75F2 F. C. Montenegro, M. D. Coutinho-Filho et S. M. Rezende J. Phys. Colloques, 49 C8 (1988) C8-1007-C8-1008 DOI: 10.1051/jphyscol:19888458