By Hardie K.A.   Vermeulen J.J.C.   Witbooi P.J.   in Topology and its Applications

ISSN:0166-8641|125|3|533-542

Elsevier‎(2002)‎

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By Giuli E.   Hardie K.A.   Vermeulen J.J.C.   in Quaestiones Mathematicae

ISSN:1727-933X|25|3|397-403

Taylor & Francis Ltd‎(2002)‎

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By Hardie K.A.   Salbany S.   Vermeulen J.J.C.   Witbooi P.J.   in Theoretical Computer Science

ISSN:0304-3975|305|1|135-158

Elsevier‎(2003)‎

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