@article{GDZPPN002339773, title = {On Riemannian 3-manifolds with distinct constant Ricci eigenvalues.}, journal = {Mathematische Annalen}, volume = {300}, year = {1994}, pages = {17-28}, zbl = {0813.53020}, url = {http://dml.mathdoc.fr/item/GDZPPN002339773} }
Kowalski, Oldrich; Prüfer, Friedbert. On Riemannian 3-manifolds with distinct constant Ricci eigenvalues.. Mathematische Annalen, Tome 300 (1994) pp. 17-28. http://gdmltest.u-ga.fr/item/GDZPPN002339773/