@article{GDZPPN002033070, title = {On two- and three-element subsets of groups.}, journal = {Aequationes mathematicae}, volume = {22}, year = {1981}, pages = {140-152}, zbl = {0489.20020}, url = {http://dml.mathdoc.fr/item/GDZPPN002033070} }
Freiman, G.A. On two- and three-element subsets of groups.. Aequationes mathematicae, Tome 22 (1981) pp. 140-152. http://gdmltest.u-ga.fr/item/GDZPPN002033070/