%0 Journal Article %A Tomasz Kobos %T An alternative proof of Petty's theorem on equilateral sets %J Annales Polonici Mathematici %D 2013 %P 165-175 %V 109 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap109-2-5/ %R 10.4064/ap109-2-5 %G en %F 10_4064_ap109_2_5