@article{IM2_1988_31_1_a6,
     author = {V. A. Plaksin},
     title = {The distribution of numbers representable as a~sum of two squares},
     journal = {Izvestiya. Mathematics },
     pages = {171--191},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1988_31_1_a6/}
}