@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://www.numdam.org/item/CM_1989__69_3_277_0/}
}