@article{GDZPPN002403331,
title = {Non-Euclidean Points in Sphere-like Spaces.},
journal = {Mathematische Zeitschrift},
volume = {105},
year = {1968},
pages = {127-132},
zbl = {0162.27104},
url = {http://dml.mathdoc.fr/item/GDZPPN002403331}
}
Koch, Robert J.; Cohen, Haskell. Non-Euclidean Points in Sphere-like Spaces.. Mathematische Zeitschrift, Tome 105 (1968) pp. 127-132. http://gdmltest.u-ga.fr/item/GDZPPN002403331/