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This author is partially supported by the Engineering Foundations of NCSU, Raleigh, N. C. 27 605, USA.
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Chung, L.O., Luh, J. Conditions for elements to be central in a ring. Acta Mathematica Academiae Scientiarum Hungaricae 34, 261–265 (1979). https://doi.org/10.1007/BF01896119
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DOI: https://doi.org/10.1007/BF01896119