@article{1214435240, author = {Bleecker, David D.}, title = {Critical Riemannian manifolds}, journal = {J. Differential Geom.}, volume = {14}, number = {1}, year = {1979}, pages = { 599-608}, language = {en}, url = {http://dml.mathdoc.fr/item/1214435240} }
Bleecker, David D. Critical Riemannian manifolds. J. Differential Geom., Tome 14 (1979) no. 1, pp. 599-608. http://gdmltest.u-ga.fr/item/1214435240/