@article{MZ_1971__123_171631,
     author = {Bernhard Amberg},
     title = {Abelian {Factorizations} of {Infinite} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {201--214},
     publisher = {mathdoc},
     volume = {123},
     year = {1971},
     zbl = {0212.36103},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__123_171631/}
}