@article{DAN_1996_348_4_a3,
     author = {A. V. Pogorelov},
     title = {Investigation of the plane in absolute geometry},
     journal = {Doklady Akademii Nauk},
     pages = {449--451},
     year = {1996},
     volume = {348},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_348_4_a3/}
}