@article{1077379134, author = {Hill, Paul}, title = {The purification of subgroups of Abelian groups}, journal = {Duke Math. J.}, volume = {37}, number = {1}, year = {1970}, pages = { 523-527}, language = {en}, url = {http://dml.mathdoc.fr/item/1077379134} }
Hill, Paul. The purification of subgroups of Abelian groups. Duke Math. J., Tome 37 (1970) no. 1, pp. 523-527. http://gdmltest.u-ga.fr/item/1077379134/