@article{CMH_1961__36_139227,
     author = {F.W. Gehring},
     title = {A remark on the moduli of rings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {42--46},
     year = {1961},
     volume = {36},
     zbl = {0104.30001},
     url = {http://geodesic.mathdoc.fr/item/CMH_1961__36_139227/}
}