@article{DAN_1990_313_5_a3,
     author = {A. V. Pogorelov},
     title = {H. {Busemann's} $G$-spaces with a {Riemannian} metric},
     journal = {Doklady Akademii Nauk},
     pages = {1044--1046},
     publisher = {mathdoc},
     volume = {313},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_5_a3/}
}