By Haxell P.   Szabo T.   Tardos G.   in Journal of Combinatorial Theory, Series B

ISSN:0095-8956|88|2|281-297

Elsevier‎(2003)‎

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By Bárány I.   Harcos G.   Pach J.   Tardos G.   in Periodica Mathematica Hungarica

ISSN:0031-5303|43|1-2|93-103

Springer Publishing Company ‎(2002)‎

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