Quasi-amicable numbers are rare.
Pollack, Paul
Journal of Integer Sequences [electronic only], Tome 14 (2011), / Harvested from The Electronic Library of Mathematics
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Publié le : 2011-01-01
EUDML-ID : urn:eudml:doc:227855 
@article{05904300,
     title = {Quasi-amicable numbers are rare.},
     journal = {Journal of Integer Sequences [electronic only]},
     volume = {14},
     year = {2011},
     zbl = {1232.11007},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05904300}
}

Pollack, Paul. Quasi-amicable numbers are rare.. Journal of Integer Sequences [electronic only], Tome 14 (2011) . http://gdmltest.u-ga.fr/item/05904300/