J.K. Srivastava, S. Ramakrishnan, A.K. Nigam, G. Chandra, R. Vijayaraghavan, et al.. Cluster spin glass behaviour of mixed spinel ferrite Ga$_{0\cdot8}$Fe$_{0\cdot2}$NiCrO$_4$.
Hyperfine Interactions, Springer Verlag, 1988, 42, pp.1079.
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