@article{10_21136_CMJ_1996_127308,
     author = {Kowalski, Old\v{r}ich},
     title = {An explicit classification of 3-dimensional {Riemannian} spaces satisfying $R(X,Y) \cdot R = 0$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {427--474},
     year = {1996},
     volume = {46},
     number = {3},
     doi = {10.21136/CMJ.1996.127308},
     mrnumber = {1408298},
     zbl = {0879.53014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1996.127308/}
}