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@article{IVM_1996_2_a1, author = {I. B. Barskii}, title = {Nonzero {Gaussian} curvature on the simplest hyperbolic surfaces}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {10--12}, publisher = {mathdoc}, number = {2}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1996_2_a1/} }
I. B. Barskii. Nonzero Gaussian curvature on the simplest hyperbolic surfaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1996), pp. 10-12. http://geodesic.mathdoc.fr/item/IVM_1996_2_a1/