@article{JIS_2011__14_5_a2,
     author = {Pollack, Paul},
     title = {Quasi-amicable numbers are rare},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2011__14_5_a2/}
}