Editing Perfect number (section)

== Further reading ==
<!-- From http://mathforum.org/library/drmath/view/51516.html -->
* Nankar, M.L.: "History of perfect numbers," Ganita Bharati 1, no. 1–2 (1979), 7–8.
* {{cite journal | last1 = Hagis | first1 = P. | year = 1973 | title = A Lower Bound for the set of odd Perfect Prime Numbers | journal = [[Mathematics of Computation]] | volume = 27 | issue = 124| pages = 951–953 | doi=10.2307/2005530| jstor = 2005530 | doi-access = free }}
* Riele, H.J.J. "Perfect Numbers and Aliquot Sequences" in H.W. Lenstra and R. Tijdeman (eds.): ''Computational Methods in Number Theory'', Vol. 154, Amsterdam, 1982, pp.&nbsp;141–157.
* Riesel, H. ''Prime Numbers and Computer Methods for Factorisation'', Birkhauser, 1985.
* {{cite book | last1=Sándor | first1=Jozsef | last2=Crstici | first2=Borislav | title=Handbook of number theory II | url=https://archive.org/details/handbooknumberth02sand | url-access=limited | location=Dordrecht | publisher=Kluwer Academic | year=2004 | isbn=1-4020-2546-7 | zbl=1079.11001 | pages=[https://archive.org/details/handbooknumberth02sand/page/n16 15]–98 }}