@article{IM2_1978_12_2_a6,
     author = {A. A. Karatsuba},
     title = {Sums of {Legendre} symbols of polynomials of second degree over prime numbers},
     journal = {Izvestiya. Mathematics},
     pages = {299--308},
     year = {1978},
     volume = {12},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1978_12_2_a6/}
}