By Kocik Jerzy   in Mathematics Magazine

ISSN:1930-0980|83|5|384-390

Mathematical Association of America‎(2010)‎

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By Kocik Jerzy   Solecki Andrzej   in American Mathematical Monthly

ISSN:1930-0972|116|3|228-237

Mathematical Association of America‎(2009)‎

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