Spectrum distribution function and variational principle for automorphic operators on hyperbolic space
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1988-1989), Exposé no. 8, 19 p. 
@article{SEDP_1988-1989____A8_0,
     author = {Efremov, D. V. and Shubin, M. A.},
     title = {Spectrum distribution function and variational principle for automorphic operators on hyperbolic space},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:8},
     pages = {1--19},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1988-1989},
     mrnumber = {1032284},
     zbl = {0698.35168},
     language = {en},
     url = {http://www.numdam.org/item/SEDP_1988-1989____A8_0/}
}
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Efremov, D. V.; Shubin, M. A. Spectrum distribution function and variational principle for automorphic operators on hyperbolic space. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1988-1989), Exposé no. 8, 19 p. http://www.numdam.org/item/SEDP_1988-1989____A8_0/

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