Euclidean planes in three-dimensional manifolds of nonpositive curvature
Matematičeskie zametki, Tome 43 (1988) no. 1, pp. 103-114.

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     author = {S. V. Buyalo},
     title = {Euclidean planes in three-dimensional manifolds of nonpositive curvature},
     journal = {Matemati\v{c}eskie zametki},
     pages = {103--114},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_1_a11/}
}
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S. V. Buyalo. Euclidean planes in three-dimensional manifolds of nonpositive curvature. Matematičeskie zametki, Tome 43 (1988) no. 1, pp. 103-114. http://geodesic.mathdoc.fr/item/MZM_1988_43_1_a11/