@article{MAN_1969__180_161791,
     author = {S.J. BERNAU},
     title = {Free {Abelian} {Lattice} {Groups.}},
     journal = {Mathematische Annalen},
     pages = {48--59},
     publisher = {mathdoc},
     volume = {180},
     year = {1969},
     zbl = {0157.36801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__180_161791/}
}