Isoperimetric inequalities in simply connected Riemann spaces of nonpositive curvature
Doklady Akademii Nauk, Tome 203 (1972) no. 2, pp. 282-284.

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@article{DAN_1972_203_2_a5,
     author = {V. K. Ionin},
     title = {Isoperimetric inequalities in simply connected {Riemann} spaces of nonpositive curvature},
     journal = {Doklady Akademii Nauk},
     pages = {282--284},
     publisher = {mathdoc},
     volume = {203},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_2_a5/}
}
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V. K. Ionin. Isoperimetric inequalities in simply connected Riemann spaces of nonpositive curvature. Doklady Akademii Nauk, Tome 203 (1972) no. 2, pp. 282-284. http://geodesic.mathdoc.fr/item/DAN_1972_203_2_a5/