@article{MR99g:11069,
   author    = {Balslev, E. and Venkov, A.},
   title     = {The {W}eyl law for subgroups of the modular group},
   journal   = {Geom. Funct. Anal.},
   year      = {1998},
   volume    = {8},
   number    = {3},
   pages     = {437--465},
   fjournal  = {Geometric and Functional Analysis},
   issn      = {1016-443X},
   coden     = {GFANFB},
   mrclass   = {11F72},
   mrnumber  = {99g:11069},
   mrrevr    = {Werner Hoffmann}
}


@article{MR99j:58213,
   author    = {Balslev, Erik},
   title     = {Spectral deformation of {L}aplacians on hyperbolic manifolds},
   journal   = {Comm. Anal. Geom.},
   year      = {1997},
   volume    = {5},
   number    = {2},
   pages     = {213--247},
   fjournal  = {Communications in Analysis and Geometry},
   issn      = {1019-8385},
   mrclass   = {58G25 (11F72 58G18)},
   mrnumber  = {99j:58213},
   mrrevr    = {Christopher M. Judge}
}


@article{selberg's-:2000,
   author    = {Erik  Balslev and Alexei Venkov},
   title     = {Selberg's eigenvalue conjecture and the Sigel zeros for Hekce $L$-series. Analysis on homogeneous spaces and representation theory of Lie groups, Okayama -- Kyoto (1997), 19--32},
   journal   = {Adv. Stud. Pure Math.},
   year      = {2000},
   volume    = {26},
   category  = {Math. Soc. Japan}
}


@article{spectral-t:2000,
   author    = {Erik  Balslev and Alexei Venkov},
   title     = {Spectral theory of Laplacians for Hecke groups with primitive character},
   journal   = {Acta Math.},
   year      = {2000},
   note      = {To appear}
}