On perfect totient numbers.
Iannucci, Douglas E. ; Deng, Moujie ; Cohen, Graeme L.
Journal of Integer Sequences [electronic only], Tome 6 (2003), / Harvested from The Electronic Library of Mathematics
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Publié le : 2003-01-01
EUDML-ID : urn:eudml:doc:51542 
@article{02186862,
     title = {On perfect totient numbers.},
     journal = {Journal of Integer Sequences [electronic only]},
     volume = {6},
     year = {2003},
     zbl = {1069.11001},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02186862}
}

Iannucci, Douglas E.; Deng, Moujie; Cohen, Graeme L. On perfect totient numbers.. Journal of Integer Sequences [electronic only], Tome 6 (2003) . http://gdmltest.u-ga.fr/item/02186862/