@article{10_4064_aa_79_4_313_332,
     author = {D. Burgess},
     title = {On the average of character sums for a group of characters},
     journal = {Acta Arithmetica},
     pages = {313--332},
     publisher = {mathdoc},
     volume = {79},
     number = {4},
     year = {1997},
     doi = {10.4064/aa-79-4-313-332},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-79-4-313-332/}
}