@article{DM_1990_2_3_a12,
     author = {S. A. Stepanov and I. E. Shparlinski},
     title = {An estimate for the incomplete sum of multiplicative characters of polynomials},
     journal = {Diskretnaya Matematika},
     pages = {115--119},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1990_2_3_a12/}
}