@article{RM_1965_20_4_a36,
     author = {Ya. G. Sinai},
     title = {Letters to the {Editor} of {Uspekhi} {Matematicheskikh} {Nauk}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1965},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1965_20_4_a36/}
}