@article{RM_1976_31_2_a13,
     author = {S. S. Pilipchuk},
     title = {A remark on a theorem of {I.} {P.~Natanson}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1976},
     volume = {31},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1976_31_2_a13/}
}