@article{10_4171_dm_34,
     author = {Ernst-Ulrich Gekeler},
     title = {On the cuspidal divisor class group of a {Drinfeld} modular curve},
     journal = {Documenta mathematica},
     pages = {351--374},
     year = {1997},
     volume = {2},
     doi = {10.4171/dm/34},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/34/}
}