@article{MZ_1985__189_173575,
     author = {Takao Yamaguchi},
     title = {The {Isometry} {Groups} of {Manifolds} of {Nonpositive} {Curvature} with {Finite} {Volume.}},
     journal = {Mathematische Zeitschrift},
     pages = {185--192},
     publisher = {mathdoc},
     volume = {189},
     year = {1985},
     zbl = {0554.53029},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__189_173575/}
}