@article{KUMEM_1995_3_2_a16,
     author = {M. Prvanovich},
     title = {On some classes of riemannian manifolds},
     journal = {In memoriam N. I. Lobatschevskii},
     pages = {164--172},
     year = {1995},
     volume = {3},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KUMEM_1995_3_2_a16/}
}