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@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/} }
Serge Lang. The Group of Automorphisms of the Modular Function Field.. Inventiones mathematicae, Tome 14 (1971), pp. 253-254. http://geodesic.mathdoc.fr/item/IM_1971__14_142115/