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@article{GFA_1991__1_2_58110, author = {P. Sarnak and R. Philips}, title = {The {Spectrum} of {Fermat} {Curves.}}, journal = {Geometric and functional analysis}, pages = {80--146}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1991}, zbl = {0751.11030}, url = {http://geodesic.mathdoc.fr/item/GFA_1991__1_2_58110/} }
P. Sarnak; R. Philips. The Spectrum of Fermat Curves.. Geometric and functional analysis, Tome 1 (1991) no. 2, pp. 80-146. http://geodesic.mathdoc.fr/item/GFA_1991__1_2_58110/