On extremal properties of compact surfaces on nonpositive extrinsic curvature
Doklady Akademii Nauk, Tome 294 (1987) no. 2, pp. 265-268.

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@article{DAN_1987_294_2_a0,
     author = {A. A. Borisenko},
     title = {On extremal properties of compact surfaces on nonpositive extrinsic curvature},
     journal = {Doklady Akademii Nauk},
     pages = {265--268},
     publisher = {mathdoc},
     volume = {294},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_2_a0/}
}
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A. A. Borisenko. On extremal properties of compact surfaces on nonpositive extrinsic curvature. Doklady Akademii Nauk, Tome 294 (1987) no. 2, pp. 265-268. http://geodesic.mathdoc.fr/item/DAN_1987_294_2_a0/