Geodesic
Character sums and small eigenvalues for Г0(p)
Glasgow mathematical journal, Tome 26 (1985), pp. 99-116

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Let Δ denote the Laplace operator acting on the space L2(Г/H) of automorphic functions with respect to a congruence group Г, square integrable over the fundamental domain F=Г/H. It is known that Δ has a point spectrumwith (Weyl's law)and it has a purely continuous spectrum on [1⁄4,∞) of finite multiplicity equal to the number of inequivalent cusps. The eigenpacket of the continuous spectrum is formed by the Eisenstein series Ea(z, s) on s = 1⁄2+it where a ranges over inequivalent cusps. The eigenfunctions ui(z) with positive eigenvalues are Maass cusp forms. 
Iwaniec, Henryk. Character sums and small eigenvalues for Г0(p). Glasgow mathematical journal, Tome 26 (1985), pp. 99-116. doi: 10.1017/S001708950000611X
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