By Daalderop F.   Fokkink R.   in Topology and its Applications

ISSN:0166-8641|102|3|297-302

Elsevier‎(2000)‎

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By Aarts J.   Fokkink R.   Vermeer J.   in Acta Mathematica Hungarica

ISSN:0236-5294|94|3|191-196

Springer Publishing Company ‎(2002)‎

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By Aarts J.M.   Fokkink R.J.   Vermeer H.   in Topology

ISSN:0040-9383|35|4|1051-1056

Elsevier‎(1996)‎

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By Aarts J.M.   Fokkink R.J.   Vermeer H.   in Topology and its Applications

ISSN:0166-8641|85|1|3-8

Elsevier‎(1998)‎

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