TY - JOUR AU - A. V. Pogorelov TI - Investigation of the plane in absolute geometry JO - Doklady Akademii Nauk PY - 1996 SP - 449 EP - 451 VL - 348 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1996_348_4_a3/ LA - ru ID - DAN_1996_348_4_a3 ER -