@article{10_4153_CMB_1968_019_2,
     author = {Smith, R.A.},
     title = {The {Circle} {Problem} in an {Arithmetic} {Progression}},
     journal = {Canadian mathematical bulletin},
     pages = {175--184},
     year = {1968},
     volume = {11},
     number = {2},
     doi = {10.4153/CMB-1968-019-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-019-2/}
}