Geodesic
Convolutions. Comparison of spectral expansions at different vertices
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 4, Tome 227 (1995), pp. 23-40 Cet article a éte moissonné depuis la source Math-Net.Ru

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Two spectral expansions of one and the same convolution at two different vertices of the fundamental domain $F_q$ for the congruence group $\Gamma_0(q)$ are compared. As a result, a representation of the space of functions of a given eigenvalue $\lambda_n$ in terms of the whole remaining spectrum is obtained. Bibliography: 3 titles. 
@article{ZNSL_1995_227_a3,
     author = {A. I. Vinogradov},
     title = {Convolutions. {Comparison} of spectral expansions at different vertices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {23--40},
     year = {1995},
     volume = {227},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_227_a3/}
}
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A. I. Vinogradov. Convolutions. Comparison of spectral expansions at different vertices. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 4, Tome 227 (1995), pp. 23-40. http://geodesic.mathdoc.fr/item/ZNSL_1995_227_a3/