@article{SM_1983_44_3_a9,
     author = {A. A. Borisenko},
     title = {On the extrinsic geometric properties of parabolic surfaces and topological properties of saddle surfaces in symmetric spaces of rank one},
     journal = {Sbornik. Mathematics},
     pages = {401--415},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_44_3_a9/}
}