@article{TM_1970_111_a8,
     author = {I. V. Ostrovskii},
     title = {A certain class of characteristic functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {195--207},
     publisher = {mathdoc},
     volume = {111},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1970_111_a8/}
}