@article{RM_2008_63_4_a1,
     author = {A. A. Karatsuba},
     title = {Arithmetic problems in the theory of {Dirichlet} characters},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {641--690},
     year = {2008},
     volume = {63},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2008_63_4_a1/}
}