@article{JRAM_1987__379_152946,
     author = {Werner Hoffmann},
     title = {The non-semi-simple term in the trace formula for rank one lattices.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--21},
     publisher = {mathdoc},
     volume = {379},
     year = {1987},
     zbl = {0609.22005},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__379_152946/}
}