@article{IM_1971__14_142115,
     author = {Serge Lang},
     title = {The {Group} of {Automorphisms} of the {Modular} {Function} {Field.}},
     journal = {Inventiones mathematicae},
     pages = {253--254},
     publisher = {mathdoc},
     volume = {14},
     year = {1971},
     zbl = {0219.14018},
     url = {http://geodesic.mathdoc.fr/item/IM_1971__14_142115/}
}