@article{1178227985, author = {Tanno, Shukichi}, title = {Ricci curvatures of contact Riemannian manifolds}, journal = {Tohoku Math. J. (2)}, volume = {40}, number = {4}, year = {1988}, pages = { 441-448}, language = {en}, url = {http://dml.mathdoc.fr/item/1178227985} }
Tanno, Shukichi. Ricci curvatures of contact Riemannian manifolds. Tohoku Math. J. (2), Tome 40 (1988) no. 4, pp. 441-448. http://gdmltest.u-ga.fr/item/1178227985/