TY  - JOUR
AU  - S. A. Shcherbakov
TI  - The degree of smoothness of horospheres, radial fields, and
JO  - Doklady Akademii Nauk
PY  - 1983
SP  - 1078
EP  - 1082
VL  - 271
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1983_271_5_a12/
LA  - ru
ID  - DAN_1983_271_5_a12
ER  -