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@article{CM_1989__69_3_277_0, author = {Gekeler, Ernst-Ulrich}, title = {Quasi-periodic functions and {Drinfeld} modular forms}, journal = {Compositio Mathematica}, pages = {277--293}, publisher = {Kluwer Academic Publishers}, volume = {69}, number = {3}, year = {1989}, mrnumber = {985916}, zbl = {0703.11066}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1989__69_3_277_0/} }
Gekeler, Ernst-Ulrich. Quasi-periodic functions and Drinfeld modular forms. Compositio Mathematica, Tome 69 (1989) no. 3, pp. 277-293. http://geodesic.mathdoc.fr/item/CM_1989__69_3_277_0/