@article{ARM_1996__32_2_a5,
     author = {Kowalski, Old\v{r}ich and Sekizawa, Masami},
     title = {Local isometry classes of {Riemannian} $3$-manifolds with constant {Ricci} eigenvalues $\rho\sb 1=\rho\sb 2\neq \rho\sb 3 > 0$},
     journal = {Archivum mathematicum},
     pages = {137--145},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1996},
     mrnumber = {1407345},
     zbl = {0903.53015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1996__32_2_a5/}
}