Geodesic
A~formula for the Chebyshev PSI function
Matematičeskie zametki, Tome 23 (1978) no. 4, pp. 497-503.

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A formula expressing the Chebyshev $\psi$ function in terms of the characteristic values of the Laplace–Beltrami operator on the fundamental domain of a modular group and the hyperbolic classes of conjugate elements of this group is derived. 
@article{MZM_1978_23_4_a0,
     author = {A. B. Venkov},
     title = {A~formula for the {Chebyshev} {PSI} function},
     journal = {Matemati\v{c}eskie zametki},
     pages = {497--503},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_4_a0/}
}
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A. B. Venkov. A~formula for the Chebyshev PSI function. Matematičeskie zametki, Tome 23 (1978) no. 4, pp. 497-503. http://geodesic.mathdoc.fr/item/MZM_1978_23_4_a0/