@article{IM2_1970_4_5_a3,
     author = {S. A. Stepanov},
     title = {Estimation of {Weyl} sums with prime denominator},
     journal = {Izvestiya. Mathematics},
     pages = {1017--1041},
     year = {1970},
     volume = {4},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_5_a3/}
}