@article{TM_1973_132_a27,
     author = {M. Jutila},
     title = {On sums of real characters},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {247--250},
     year = {1973},
     volume = {132},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_1973_132_a27/}
}