@article{IM2_1968_2_1_a6,
     author = {A. F. Lavrik},
     title = {Approximate functional equations for {Dirichlet} functions},
     journal = {Izvestiya. Mathematics},
     pages = {129--179},
     year = {1968},
     volume = {2},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a6/}
}