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@article{AA_1994_6_4_a2, author = {L. R. Volkovyskii}, title = {Plane geodesically complete subsets in spaces of nonpositive curvature}, journal = {Algebra i analiz}, pages = {90--100}, publisher = {mathdoc}, volume = {6}, number = {4}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AA_1994_6_4_a2/} }
L. R. Volkovyskii. Plane geodesically complete subsets in spaces of nonpositive curvature. Algebra i analiz, Tome 6 (1994) no. 4, pp. 90-100. http://geodesic.mathdoc.fr/item/AA_1994_6_4_a2/