@article{10_21136_MB_1999_125981,
     author = {Kowalski, Old\v{r}ich and Vl\'a\v{s}ek, Zden\v{e}k},
     title = {On special {Riemannian} $3$-manifolds with distinct constant {Ricci} eigenvalues},
     journal = {Mathematica Bohemica},
     pages = {45--66},
     publisher = {mathdoc},
     volume = {124},
     number = {1},
     year = {1999},
     doi = {10.21136/MB.1999.125981},
     mrnumber = {1687417},
     zbl = {0934.53027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1999.125981/}
}