@article{1183416965,
author = {Keyser, C. J.},
title = {Concerning the angles and the angular determination of planes in 4--space},
journal = {Bull. Amer. Math. Soc.},
volume = {9},
number = {3},
year = {1902},
pages = { 324-329},
language = {en},
url = {http://dml.mathdoc.fr/item/1183416965}
}
Keyser, C. J. Concerning the angles and the angular determination of planes in 4–space. Bull. Amer. Math. Soc., Tome 9 (1902) no. 3, pp. 324-329. http://gdmltest.u-ga.fr/item/1183416965/