@article{CMH_1960__34_139193,
     author = {Heinz Renggli},
     title = {Zur {Definition} der quasikonformen {Abbildungen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {222--226},
     publisher = {mathdoc},
     volume = {34},
     year = {1960},
     zbl = {0094.28001},
     url = {http://geodesic.mathdoc.fr/item/CMH_1960__34_139193/}
}