%0 Journal Article %A %T Preface, Contents %J Banach Center Publications %D 1992 %P 1-8 %V 27 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/-27-1-1-8/ %R 10.4064/-27-1-1-8 %G en %F 10_4064__27_1_1_8