@article{MZ_1984__185_173385,
     author = {G\"unter T\"orner and Hans-Heinrich Brungs},
     title = {Extensions of {Chain} {Rings.}},
     journal = {Mathematische Zeitschrift},
     pages = {93--104},
     year = {1984},
     volume = {185},
     zbl = {0533.16017},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__185_173385/}
}