%0 Journal Article %A Hans Herda %T A characterization of spheres among compact 3-bodies satisfying Crofton's theorem %J Colloquium Mathematicum %D 1976 %P 235-236 %V 36 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-36-2-235-236/ %R 10.4064/cm-36-2-235-236 %G en %F 10_4064_cm_36_2_235_236