%0 Journal Article
%A R. de Sapio
%T Differential Structures on a Product of Spheres.
%J Commentarii mathematici Helvetici
%D 1969
%P 61-69
%V 44
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1969__44_139381/
%F CMH_1969__44_139381