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@article{MZ_1968__107_171063, author = {R.B., Jr. Warfield}, title = {Homomorphisms and {Duality} for {Torsion-free} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {189--200}, publisher = {mathdoc}, volume = {107}, year = {1968}, zbl = {0169.03602}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171063/} }
R.B., Jr. Warfield. Homomorphisms and Duality for Torsion-free Groups.. Mathematische Zeitschrift, Tome 107 (1968), pp. 189-200. http://geodesic.mathdoc.fr/item/MZ_1968__107_171063/