@article{1270042394, author = {KOUFOGIORGOS, Themis}, title = {Contact Riemannian Manifolds with Constant $\varphi$-Sectional Curvature}, journal = {Tokyo J. of Math.}, volume = {20}, number = {2}, year = {1997}, pages = { 13-22}, language = {en}, url = {http://dml.mathdoc.fr/item/1270042394} }
KOUFOGIORGOS, Themis. Contact Riemannian Manifolds with Constant $\varphi$-Sectional Curvature. Tokyo J. of Math., Tome 20 (1997) no. 2, pp. 13-22. http://gdmltest.u-ga.fr/item/1270042394/