@article{IM2_1993_41_1_a9,
     author = {V. K. Bulitko},
     title = {Letter to the editor},
     journal = {Izvestiya. Mathematics},
     pages = {185},
     year = {1993},
     volume = {41},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_1_a9/}
}