By Brand N.   Tejada D.M.   in Topology and its Applications

ISSN:0166-8641|76|1|79-93

Elsevier‎(1997)‎

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By Hilden H. M.   Montesinos J. M.   Tejada D. M.   Toro M. M.   in American Mathematical Monthly

ISSN:1930-0972|118|4|327-343

Mathematical Association of America‎(2011)‎

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