Yamada, Tomohiro (2019). “A new upper bound for odd perfect numbers of a special form”. Colloquium Mathematicum156 (1): 15--21. doi:10.4064/cm7339-3-2018. ISSN1730-6302.
T. Goto and Y. Ohno, "Odd perfect numbers have a prime factor exceeding 108", Math. Comp. 77 (2008), 1859-1868. "奇数の完全数の最大素因子について" - preprint を入手可能。
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75個以上であることを示した、以前の結果は K. G. Hare, "New techniques for bounds on the total number of prime factors of an odd perfect number", Math. Comp. 76. (2007), 2241-2248. preprint
Yamada, Tomohiro (2019). “A new upper bound for odd perfect numbers of a special form”. Colloquium Mathematicum156 (1): 15--21. doi:10.4064/cm7339-3-2018. ISSN1730-6302.