@article{IM2_1991_36_1_a8,
     author = {V. A. Oskolkov},
     title = {Hardy--Littlewood problems on the uniform distribution of arithmetic progressions},
     journal = {Izvestiya. Mathematics },
     pages = {169--182},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_36_1_a8/}
}