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- G. Mustafa, R. Mehmood, Mian H. R. Mahmood, Z. Farooq, M. Fakhar-e-Alam, S. M. Ahmad, M. Yaseen, M. A. Qayyum, N. Ahmad, H. Akhtar " Study of structural and magnetic properties, trivalent cation substitution of cobalt base spinel ferrites CoCr0.04GdxFe1.96-xO4 (0 ≤ x ≤ 0.12) " .........................p. 81 - 87 (pdf file)