@article{IVM_1993_7_a4,
     author = {A. B. Kotlyar},
     title = {On the upper bound on the {Gaussian} curvature for a~class of irregular surfaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {29--34},
     year = {1993},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1993_7_a4/}
}