@article{DAN_1997_352_4_a1,
     author = {I. A. Bykadorov and G. Sh. Rubinshtein},
     title = {Some families of discrete extremal problems on unbounded locally},
     journal = {Doklady Akademii Nauk},
     pages = {443--445},
     publisher = {mathdoc},
     volume = {352},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_352_4_a1/}
}