TY  - JOUR
AU  - V. K. Ionin
TI  - Isoperimetric inequalities in simply connected Riemann spaces of nonpositive curvature
JO  - Doklady Akademii Nauk
PY  - 1972
SP  - 282
EP  - 284
VL  - 203
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1972_203_2_a5/
LA  - ru
ID  - DAN_1972_203_2_a5
ER  -