@article{JRAM_1877__83_148341,
     author = {Simon Newcomb},
     title = {Elementary theorems relating to the geometry of a space of three dimensions and of uniform positive curvature in the fourth dimension.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {293--299},
     publisher = {mathdoc},
     volume = {83},
     year = {1877},
     zbl = {09.0381.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1877__83_148341/}
}