@misc{SM_1982_43_3_a2,
     title = {Letter to the editor},
     journal = {Sbornik. Mathematics},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_43_3_a2/}
}