%0 Journal Article %A M. Fabian %T On an extension of norms from a subspace to the whole Banach space keeping their rotundity %J Studia Mathematica %D 1994 %P 203-211 %V 112 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-112-3-203-211/ %R 10.4064/sm-112-3-203-211 %G en %F 10_4064_sm_112_3_203_211