@article{AM2_1971__6_136197,
     author = {J\"URG RATZ},
     title = {Zur {Linearit\"at} verallgemeinerter {Modulisometrien}},
     journal = {Aequationes mathematicae},
     pages = {249--255},
     publisher = {mathdoc},
     volume = {6},
     year = {1971},
     zbl = {0223.15018},
     url = {http://geodesic.mathdoc.fr/item/AM2_1971__6_136197/}
}