%0 Journal Article
%A A. N., Rao
%T On a principle of duality in circle sphere and line geometries
%J Mathematische Zeitschrift
%D 1939
%P 185-194
%V 44
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1939__44_168800/
%F MZ_1939__44_168800