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H. E. Bell and M. N. Daif, On commutativity and strong commutativity preserving maps, Canad. Math. Bull. 37 (1994), no. 4, 443-447
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H. E. Bell and W. S. Martindale, Centralizing mappings of semiprime rings, Canad. Math. Bull. 30 (1987), no. 1, 92-101
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M. Bresar, Commuting traces of biadditive mappings, commutativity preserving mappings and Lie mappings,. Trans. Amer. Math. Soc. 335 (1993), no. 2, 525- 546
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M. N. Daif and H. E. Bell, Remarks on derivations on semiprime rings, Int. J. Math. Math. Sci. 15 (1992), no. 1, 205-206
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