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@article{MZM_1990_47_4_a5, author = {S. B. Kadomtsev}, title = {Surfaces with constant extrinsic geometry of negative curvature}, journal = {Matemati\v{c}eskie zametki}, pages = {41--45}, publisher = {mathdoc}, volume = {47}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_4_a5/} }
S. B. Kadomtsev. Surfaces with constant extrinsic geometry of negative curvature. Matematičeskie zametki, Tome 47 (1990) no. 4, pp. 41-45. http://geodesic.mathdoc.fr/item/MZM_1990_47_4_a5/