@article{ADM_2020_29_2_a10,
     author = {S. Varbanets and Ya. Vorobyov},
     title = {Norm of {Gaussian} integers in arithmetical progressions and narrow sectors},
     journal = {Algebra and discrete mathematics},
     pages = {259--270},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2020_29_2_a10/}
}