@article{MM2_1995__86_3_156060,
     author = {Ernst-Ulrich Gekeler},
     title = {Improper {Eisenstein} {Series} on {Bruhat-Tits} {Trees.}},
     journal = {Manuscripta mathematica},
     pages = {367--392},
     publisher = {mathdoc},
     volume = {86},
     number = {3},
     year = {1995},
     zbl = {0884.11025},
     url = {http://geodesic.mathdoc.fr/item/MM2_1995__86_3_156060/}
}