@article{SM_1973_20_1_a8,
     author = {P. P. Mosolov},
     title = {Letter to the {Editor}},
     journal = {Sbornik. Mathematics},
     pages = {155},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_20_1_a8/}
}