@article{DAN_1981_261_4_a6,
     author = {V. B. Marenich},
     title = {The metric structure of open manifolds of nonnegative curvature},
     journal = {Doklady Akademii Nauk},
     pages = {801--804},
     publisher = {mathdoc},
     volume = {261},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_4_a6/}
}