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