@misc{ZNSL_1981_113_a22,
     title = {Letter to the {Editor}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {272},
     year = {1981},
     volume = {113},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_113_a22/}
}