@article{MZ_1963__81_170154,
     author = {Gilbert Baumslag},
     title = {Wreath products and extensions.},
     journal = {Mathematische Zeitschrift},
     pages = {286--299},
     publisher = {mathdoc},
     volume = {81},
     year = {1963},
     zbl = {0123.02202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1963__81_170154/}
}