@article{IM2_2011_75_4_a7,
     author = {M. A. Korolev},
     title = {Letter to the editors},
     journal = {Izvestiya. Mathematics},
     pages = {869},
     year = {2011},
     volume = {75},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2011_75_4_a7/}
}