@article{10_4064_aa113_3_4,
     author = {Werner Georg Nowak},
     title = {Lattice points in a circle:
 {An} improved mean-square asymptotics},
     journal = {Acta Arithmetica},
     pages = {259--272},
     publisher = {mathdoc},
     volume = {113},
     number = {3},
     year = {2004},
     doi = {10.4064/aa113-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa113-3-4/}
}