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@article{MZ_1939__44_168800, author = {A. N., Rao}, title = {On a principle of duality in circle sphere and line geometries}, journal = {Mathematische Zeitschrift}, pages = {185--194}, publisher = {mathdoc}, volume = {44}, year = {1939}, zbl = {64.0656.02}, url = {http://geodesic.mathdoc.fr/item/MZ_1939__44_168800/} }
A. N., Rao. On a principle of duality in circle sphere and line geometries. Mathematische Zeitschrift, Tome 44 (1939), pp. 185-194. http://geodesic.mathdoc.fr/item/MZ_1939__44_168800/