@article{DOCMA_1997__2__a1,
     author = {Gekeler, Ernst-Ulrich},
     title = {On the cuspidal divisor class group of a {Drinfeld} modular curve},
     journal = {Documenta mathematica},
     pages = {351--374},
     publisher = {mathdoc},
     volume = {2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1997__2__a1/}
}