@article{DAN_1990_314_4_a4,
     author = {A. V. Pogorelov},
     title = {Solution of a problem of {H.} {Busemann}},
     journal = {Doklady Akademii Nauk},
     pages = {790--792},
     publisher = {mathdoc},
     volume = {314},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_314_4_a4/}
}