A note on -groups for .
Ušan, Janez (1999)
Novi Sad Journal of Mathematics
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Ušan, Janez (1999)
Novi Sad Journal of Mathematics
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Tomáš Kepka (2001)
Acta Universitatis Carolinae. Mathematica et Physica
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П. Немец (1976)
Matematiceskie issledovanija
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(1997)
Acta Universitatis Carolinae. Mathematica et Physica
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B. P. Alimpić (1979)
Publications de l'Institut Mathématique
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(1978)
Acta Universitatis Carolinae. Mathematica et Physica
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V. Sathyabhama (1977)
Časopis pro pěstování matematiky
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