@article{JIS_2011__14_5_a0,
     author = {Weingartner,  Andreas},
     title = {On the solutions of \(\sigma (n) = \sigma (n+k)\)},
     journal = {Journal of integer sequences},
     year = {2011},
     volume = {14},
     number = {5},
     zbl = {1231.11006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2011__14_5_a0/}
}