@article{DAN_1979_247_1_a3,
     author = {V. L. Gurevich},
     title = {Two-dimensional manifolds of bounded curvature},
     journal = {Doklady Akademii Nauk},
     pages = {22--25},
     year = {1979},
     volume = {247},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_1_a3/}
}