Geodesic
Surfaces of negative extrinsic curvature in a Riemannian space with nonpositive Riemannian curvature
Doklady Akademii Nauk, Tome 194 (1970) no. 4, pp. 747-749.

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@article{DAN_1970_194_4_a1,
     author = {I. S. Brandt},
     title = {Surfaces of negative extrinsic curvature in a {Riemannian} space with nonpositive {Riemannian} curvature},
     journal = {Doklady Akademii Nauk},
     pages = {747--749},
     publisher = {mathdoc},
     volume = {194},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_4_a1/}
}
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I. S. Brandt. Surfaces of negative extrinsic curvature in a Riemannian space with nonpositive Riemannian curvature. Doklady Akademii Nauk, Tome 194 (1970) no. 4, pp. 747-749. http://geodesic.mathdoc.fr/item/DAN_1970_194_4_a1/