Geodesic
The sum of Dirichlet characters of a polynomial over a reduced residue system
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2009), pp. 40-43 
V. N. Chubarikov. The sum of Dirichlet characters of a polynomial over a reduced residue system. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2009), pp. 40-43. http://geodesic.mathdoc.fr/item/VMUMM_2009_3_a6/
@article{VMUMM_2009_3_a6,
     author = {V. N. Chubarikov},
     title = {The sum of {Dirichlet} characters of a polynomial over a reduced residue system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {40--43},
     year = {2009},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2009_3_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A root estimate is obtained for a sum of Dirichlet characters of the polynomial $ax^n+b$ over a reduced residue system.