@article{CM_1951__8__81_0,
     author = {Haegi, Hans R.},
     title = {Extremalprobleme und {Ungleichungen} konformer {Gebietsgr\"o{\ss}en}},
     journal = {Compositio Mathematica},
     pages = {81--111},
     publisher = {Kraus Reprint},
     volume = {8},
     year = {1951},
     mrnumber = {39811},
     zbl = {0041.05101},
     language = {de},
     url = {http://www.numdam.org/item/CM_1951__8__81_0/}
}