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@article{AM2_1981__22_136869, author = {G.A. Freiman}, title = {On two- and three-element subsets of groups.}, journal = {Aequationes mathematicae}, pages = {140--152}, publisher = {mathdoc}, volume = {22}, year = {1981}, zbl = {0489.20020}, url = {http://geodesic.mathdoc.fr/item/AM2_1981__22_136869/} }
G.A. Freiman. On two- and three-element subsets of groups.. Aequationes mathematicae, Tome 22 (1981), pp. 140-152. http://geodesic.mathdoc.fr/item/AM2_1981__22_136869/