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@article{DAN_1991_319_4_a5, author = {V. P. Gromov}, title = {Nontrivial expansion of zero and representative systems of the}, journal = {Doklady Akademii Nauk}, pages = {801--805}, publisher = {mathdoc}, volume = {319}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_4_a5/} }
V. P. Gromov. Nontrivial expansion of zero and representative systems of the. Doklady Akademii Nauk, Tome 319 (1991) no. 4, pp. 801-805. http://geodesic.mathdoc.fr/item/DAN_1991_319_4_a5/