@article{MZM_1979_26_1_a15,
     author = {V. A. Sharafutdinov},
     title = {Convex sets in a~manifold of nonnegative curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {129--136},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_26_1_a15/}
}