Srinivasan, A. K., Practical numbers(PDF), Current Science, 1948, 17: 179–180 [2013-01-13], MR 0027799, (原始内容存档(PDF)于2019-11-16)
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Stewart, B. M., Sums of distinct divisors, American Journal of Mathematics (The Johns Hopkins University Press), 1954, 76 (4): 779–785, JSTOR 2372651, MR 0064800, doi:10.2307/2372651
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Hausman, Miriam; Shapiro, Harold N., On practical numbers, Communications on Pure and Applied Mathematics, 1984, 37 (5): 705–713, MR 0752596, doi:10.1002/cpa.3160370507
Margenstern, Maurice, Les nombres pratiques: théorie, observations et conjectures, Journal of Number Theory, 1991, 37 (1): 1–36, MR 1089787, doi:10.1016/S0022-314X(05)80022-8
Melfi, Giuseppe, On two conjectures about practical numbers, Journal of Number Theory, 1996, 56 (1): 205–210, MR 1370203, doi:10.1006/jnth.1996.0012
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ias.ac.in
Srinivasan, A. K., Practical numbers(PDF), Current Science, 1948, 17: 179–180 [2013-01-13], MR 0027799, (原始内容存档(PDF)于2019-11-16)
jstor.org
Stewart, B. M., Sums of distinct divisors, American Journal of Mathematics (The Johns Hopkins University Press), 1954, 76 (4): 779–785, JSTOR 2372651, MR 0064800, doi:10.2307/2372651
web.archive.org
Srinivasan, A. K., Practical numbers(PDF), Current Science, 1948, 17: 179–180 [2013-01-13], MR 0027799, (原始内容存档(PDF)于2019-11-16)