@article{GDZPPN002416409, title = {Direct Decompositions of Finitely Generated Torsion-Free Nilpotent Groups.}, journal = {Mathematische Zeitschrift}, volume = {142}, year = {1975}, pages = {1-10}, zbl = {0315.20029}, url = {http://dml.mathdoc.fr/item/GDZPPN002416409} }
Baumslag, Gilbert. Direct Decompositions of Finitely Generated Torsion-Free Nilpotent Groups.. Mathematische Zeitschrift, Tome 142 (1975) pp. 1-10. http://gdmltest.u-ga.fr/item/GDZPPN002416409/