@article{1138043720,
author = {Kwon, Jung-Hwan and Suh, Young Jin},
title = {On sectional and Ricci curvatures of semi-Riemannian submersions},
journal = {Kodai Math. J.},
volume = {20},
number = {1},
year = {1997},
pages = { 53-66},
language = {en},
url = {http://dml.mathdoc.fr/item/1138043720}
}
Kwon, Jung-Hwan; Suh, Young Jin. On sectional and Ricci curvatures of semi-Riemannian submersions. Kodai Math. J., Tome 20 (1997) no. 1, pp. 53-66. http://gdmltest.u-ga.fr/item/1138043720/