@article{10_4153_CJM_1999_014_3,
     author = {Deitmar, Anton and Hoffman, Werner},
     title = {Spectral {Estimates} for {Towers} of {Noncompact} {Quotients}},
     journal = {Canadian journal of mathematics},
     pages = {266--293},
     year = {1999},
     volume = {51},
     number = {2},
     doi = {10.4153/CJM-1999-014-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1999-014-3/}
}