@article{MAT_1963_7_4_a0,
     author = {D. A. Burgess},
     title = {On character sums and primitive roots},
     journal = {Matematika},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1963_7_4_a0/}
}