Geodesic
The fundamental group and the spectrum of the Laplacian.
Commentarii mathematici Helvetici, Tome 56 (1981), pp. 581-598.

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Mots-clés : fundamental group, spectrum of Laplacian, Laplace-Beltrami operator, lowest eigenvalue, universal cover, compact Riemannian manifold, amenable fundamental group 
@article{CMH_1981__56_139885,
     author = {Robert Brooks},
     title = {The fundamental group and the spectrum of the {Laplacian.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {581--598},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0495.58029},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139885/}
}
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Robert Brooks. The fundamental group and the spectrum of the Laplacian.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 581-598. http://geodesic.mathdoc.fr/item/CMH_1981__56_139885/