@article{RM_1986_41_2_a30,
     author = {V. D. Batukhtin},
     title = {On a~problem on the extremum of discontinuous mappings},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1986_41_2_a30/}
}