@article{DAN_1971_196_4_a5,
     author = {A. A. Karatsuba},
     title = {Distribution of power residues and nonresidues in additive sequences},
     journal = {Doklady Akademii Nauk},
     pages = {759--760},
     publisher = {mathdoc},
     volume = {196},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_4_a5/}
}