@article{MZ_1984__186_173461,
     author = {Bernhard Liehl},
     title = {Beschr\"ankte {Wortl\"ange} in {SL2.}},
     journal = {Mathematische Zeitschrift},
     pages = {509--524},
     publisher = {mathdoc},
     volume = {186},
     year = {1984},
     zbl = {0523.20028},
     url = {http://geodesic.mathdoc.fr/item/MZ_1984__186_173461/}
}