@article{10_21136_CMJ_1994_128440,
     author = {Ermolitski, A. A.},
     title = {Riemannian regular $\sigma$-manifolds},
     journal = {Czechoslovak Mathematical Journal},
     pages = {57--66},
     year = {1994},
     volume = {44},
     number = {1},
     doi = {10.21136/CMJ.1994.128440},
     mrnumber = {1257936},
     zbl = {0812.53046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1994.128440/}
}