@article{MZ_1964__84_170260,
     author = {Helmut Grunsky},
     title = {\"Uber eine {Borelsche} {Identit\"at.}},
     journal = {Mathematische Zeitschrift},
     pages = {233--243},
     year = {1964},
     volume = {84},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__84_170260/}
}