@article{MZ_1956__64_169567,
     author = {Ernst Witt},
     title = {Die {Unterringe} der freien {Lieschen} {Ringe.}},
     journal = {Mathematische Zeitschrift},
     pages = {195--216},
     publisher = {mathdoc},
     volume = {64},
     year = {1956},
     zbl = {0070.02903},
     url = {http://geodesic.mathdoc.fr/item/MZ_1956__64_169567/}
}