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The properties of spin-glasses with uniaxial anisotropy are investigated by magnetization measurements on single crysta1s of Y and Se doped with Er, Dy, Tb, or Gd impurities. In alloys with strong anisotropy, spin-glass properties (susceptibility, cusp, irreversibility) appear only for fields along the c axis of the érystal (lsing-like systems) or only for fie1ds in the basal plane (X-Y -like systems). The freezing temperature of the Ising-like systems is higher than that of the Heisenbergdoi:10.1103/physrevb.29.4999 fatcat:pz22tboxjfeibkcjs2mhb3kkay