@article{10_4064_cm_27_2_283_291,
     author = {Jan \'Sliwa},
     title = {On distribution of values of \ensuremath{\sigma}(n) in residue classes},
     journal = {Colloquium Mathematicum},
     pages = {283--291},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1973},
     doi = {10.4064/cm-27-2-283-291},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-27-2-283-291/}
}