強正則グラフ
↑ https://projecteuclid.org/euclid.pjm/1103035734, R. C. Bose, Strongly regular graphs, partial geometries and partially balanced designs, Pacific J. Math 13 (1963) 389–419. (p. 122)
↑ Brouwer, Andries E; Haemers, Willem H. Spectra of Graphs. p. 101 Archived 2012-03-16 at the Wayback Machine.
↑ Godsil & Royle 2001, p. 218.
↑ Cameron, P.J.; van Lint, J.H. (1991), Designs, Graphs, Codes and their Links, London Mathematical Society Student Texts 22, Cambridge University Press, p. 37, ISBN 978-0-521-42385-4
↑ Godsil & Royle 2001, p. 220, Lemma 10.2.1.
↑ Conway, John H., Five $1,000 Problems (Update 2017), Online Encyclopedia of Integer Sequences, https://oeis.org/A248380/a248380.pdf 2019年2月12日閲覧。