%0 Journal Article %A Alexander Goncharov %T A compact set without Markov's property but with an extension operator for $C^∞$-functions %J Studia Mathematica %D 1996 %P 27-35 %V 119 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-119-1-27-35/ %R 10.4064/sm-119-1-27-35 %G en %F 10_4064_sm_119_1_27_35