@article{GDZPPN002378078,
title = {On a principle of duality in circle sphere and line geometries},
journal = {Mathematische Zeitschrift},
volume = {45},
year = {1939},
pages = {185-194},
zbl = {64.0656.02},
url = {http://dml.mathdoc.fr/item/GDZPPN002378078}
}
Rao, A. N.,. On a principle of duality in circle sphere and line geometries. Mathematische Zeitschrift, Tome 45 (1939) pp. 185-194. http://gdmltest.u-ga.fr/item/GDZPPN002378078/