@article{TRSPY_1951_38_a21,
     author = {N. G. Chudakov and A. K. Pavlyuchuk},
     title = {On summation functions of characters of numerical groups with a finite basis},
     journal = {Informatics and Automation},
     pages = {366--381},
     publisher = {mathdoc},
     volume = {38},
     year = {1951},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a21/}
}