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Corrigendum |
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| Authors: | Y. Fong S. Veldsman R. Wiegandt |
| Affiliation: | 1. Department of Mathematics , National Cheng-Kung University , R.O.C., Tainan , Taiwan , 70101;2. Department of Mathematics , University of Port Elizabeth , Port Elizabeth , 6000 , South Africa;3. Hungarian Academy of Sciences , Mathematical Institute , P.O. Box 127, Budapest , Hungary , H-1364 |
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