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

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