@article{IM2_1983_21_3_a8,
     author = {E. M. Nikishin},
     title = {Letter to the {Editor}},
     journal = {Izvestiya. Mathematics },
     pages = {609},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_3_a8/}
}