@article{1029002401,
author = {Johnson, David L.},
title = {Sectional curvature and curvature normal forms.},
journal = {Michigan Math. J.},
volume = {27},
number = {1},
year = {1980},
pages = { 275-294},
language = {en},
url = {http://dml.mathdoc.fr/item/1029002401}
}
Johnson, David L. Sectional curvature and curvature normal forms.. Michigan Math. J., Tome 27 (1980) no. 1, pp. 275-294. http://gdmltest.u-ga.fr/item/1029002401/