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\begin{thebibliography}{10}

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\bibitem{BerC99}

4
A.~Bernasconi and B.~Codenotti.

5
\newblock Spectral analysis of {Boolean} functions as a graph eigenvalue

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  problem.

7
\newblock {\em IEEE Transactions on Computers}, 48(3):345--351, (1999).

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\bibitem{Cra95}

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R.~Craigen.

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\newblock Signed groups, sequences, and the asymptotic existence of {Hadamard}

12
  matrices.

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\newblock {\em J. Combin. Theory Ser. A}, 71(2):241--254, (1995).

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\bibitem{GerP74a}

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A.~V. Geramita and N.~J. Pullman.

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\newblock A theorem of {Hurwitz and Radon} and orthogonal projective modules.

18
\newblock {\em Proceedings of the American Mathematical Society}, 42(1):51--56,

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  (1974).

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\bibitem{Hur22}

22
A.~Hurwitz.

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\newblock {\"Uber} die {Komposition} der quadratischen {Formen}.

24
\newblock {\em Math. Ann.}, 88(1-2):1--25, (1922).

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\bibitem{Leo16Classifying}

27
P.~Leopardi.

28
\newblock {Classifying bent functions by their Cayley graphs}.

29
\newblock In preparation.

30


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\bibitem{Leo05}

32
P.~Leopardi.

33
\newblock A generalized {FFT} for {Clifford} algebras.

34
\newblock {\em Bulletin of the Belgian Mathematical Society -- Simon Stevin},

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  11(5):663--688, (2004).

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\bibitem{Leo14Constructions}

38
P.~Leopardi.

39
\newblock Constructions for {Hadamard} matrices, {Clifford} algebras, and their

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  relation to amicability / anti-amicability graphs.

41
\newblock {\em Australasian Journal of Combinatorics}, 58(2):214--248, (2014).

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\bibitem{Leo15Twin}

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P.~C. Leopardi.

45
\newblock Twin bent functions and {Clifford} algebras.

46
\newblock In {\em Algebraic Design Theory and Hadamard Matrices},  189--199.

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  Springer, (2015).

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\bibitem{Rad22}

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J.~Radon.

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\newblock Lineare {Scharen} orthogonaler {Matrizen}.

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\newblock {\em Abhandlungen aus dem Mathematischen Seminar der Universit{\"a}t

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  Hamburg}, 1(1):1--14, (1922).

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\bibitem{Wil44}

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J.~Williamson.

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\newblock Hadamard's determinant theorem and the sum of four squares.

58
\newblock {\em Duke Math. J.}, 11:65--81, (1944).

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\bibitem{Yiu90}

61
P.~Y. Yiu.

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\newblock Strongly regular graphs and {Hurwitz-Radon} numbers.

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\newblock {\em Graphs and Combinatorics}, 6(1):61--69, (1990).

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\end{thebibliography}

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