@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/}
}