@article{MAN_1981__257_163568,
     author = {M. Cohen and W. Metzler and A. Zimmermann},
     title = {What {Does} a {Basis} of {F(a,} b) {Look} {Like?}},
     journal = {Mathematische Annalen},
     pages = {435--446},
     publisher = {mathdoc},
     volume = {257},
     year = {1981},
     zbl = {0458.20028},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__257_163568/}
}