%0 Journal Article %A Jakub Onufry Wojtaszczyk %T No return to convexity %J Studia Mathematica %D 2010 %P 227-239 %V 199 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm199-3-2/ %R 10.4064/sm199-3-2 %G en %F 10_4064_sm199_3_2