@article{MAN_1981__258_163603,
     author = {Ch. Pommerenke},
     title = {Polymorphic {Functions} for {Groups} of {Divergence} {Type.}},
     journal = {Mathematische Annalen},
     pages = {353--366},
     publisher = {mathdoc},
     volume = {258},
     year = {1981},
     zbl = {0489.30036},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__258_163603/}
}