Geodesic
Euclidean planes in open three-dimensional manifolds of nonpositive curvature
Algebra i analiz, Tome 3 (1991) no. 1, pp. 102-117.

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     author = {S. V. Buyalo},
     title = {Euclidean planes in open three-dimensional manifolds of nonpositive curvature},
     journal = {Algebra i analiz},
     pages = {102--117},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1991_3_1_a3/}
}
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S. V. Buyalo. Euclidean planes in open three-dimensional manifolds of nonpositive curvature. Algebra i analiz, Tome 3 (1991) no. 1, pp. 102-117. http://geodesic.mathdoc.fr/item/AA_1991_3_1_a3/