@article{MZM_1968_3_5_a14,
     author = {A. F. Lavrik},
     title = {Functional and approximate functional equations of the {Dirichlet} function},
     journal = {Matemati\v{c}eskie zametki},
     pages = {613--622},
     publisher = {mathdoc},
     volume = {3},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_5_a14/}
}