@article{SM_2018_209_6_a8,
     author = {V. A. Kozlov and S. A. Nazarov},
     title = {Letter to the editors},
     journal = {Sbornik. Mathematics},
     pages = {919},
     publisher = {mathdoc},
     volume = {209},
     number = {6},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2018_209_6_a8/}
}