@article{RM_1969_24_1_a19,
     author = {A. G. Postnikov and G. A. Freiman},
     title = {Inter-College {Symposium} on {Number} {Theory}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1969_24_1_a19/}
}