@article{1077490204,
author = {Brown, Arthur B.},
title = {Critical curvatures in Riemannian spaces},
journal = {Duke Math. J.},
volume = {3},
number = {1},
year = {1937},
pages = { 473-483},
language = {en},
url = {http://dml.mathdoc.fr/item/1077490204}
}
Brown, Arthur B. Critical curvatures in Riemannian spaces. Duke Math. J., Tome 3 (1937) no. 1, pp. 473-483. http://gdmltest.u-ga.fr/item/1077490204/