@article{SM_1983_44_4_a7,
     author = {\`E. R. Rozendorn},
     title = {Bounded complete weakly nonregular surfaces with negative curvature bounded away from zero},
     journal = {Sbornik. Mathematics},
     pages = {501--509},
     publisher = {mathdoc},
     volume = {44},
     number = {4},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1983_44_4_a7/}
}