@article{MZ_1978__159_172648,
     author = {Ulrich Mertins},
     title = {Verwandte {Operatoren.}},
     journal = {Mathematische Zeitschrift},
     pages = {107--122},
     publisher = {mathdoc},
     volume = {159},
     year = {1978},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__159_172648/}
}