%0 Journal Article %A Shing Tung Yau %A H. Blaine jr. Lawson %T Scalar Curvature, Non-Abelian Group Actions, and the Degree of Symmetry of Exotic Spheres %J Commentarii mathematici Helvetici %D 1974 %P 232-244 %V 49 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1974__49_139582/ %F CMH_1974__49_139582