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- Apostolos Beligiannis
- a Department of Mathematics , University of Ioannina , loannina, 45110, Greece
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- Nikolaos Marmaridis
- a Department of Mathematics , University of Ioannina , loannina, 45110, Greece
収録刊行物
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- Communications in Algebra
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Communications in Algebra 22 (12), 5021-5036, 1994-01
Informa UK Limited