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REFERENCES
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J. Hadamard, R\'{e}solution d'une question relative aux d\'{e}terminants, Bull. des Sciences Math. 2 (1893), 240-246.
H. Kharaghani and B. Tayfeh-Rezaie, On the classification of Hadamard matrices of order 32, J. Combin. Des., 18 (2010), 328-336.
H. Kharaghani and B. Tayfeh-Rezaie, Hadamard matrices of order 32, math.ipm.ac.ir/tayfeh-r/papersandpreprints/H32typetwo.pdf
Kimura, H., (1986), Hadamard matrices of order 28 with automorphism groups of order two, J. Combin. Theory, A 43, 98-102.
Kimura, H., (1989), New Hadamard matrix of order 24, Graphs Combin., 5, 235-242.
Kimura, H., (1994), Classification of Hadamard matrices of order 28 with Hall sets, Discrete Math., 128, 257-268.
Kimura, H., (1994), Classification of Hadamard matrices of order 28, Discrete Math., 133, 171-180.
W. P. Orrick, Switching operations for Hadamard matrices, http://arXiv.org/abs/math.CO/0507515. (Gives lower bounds for a(8) and a(9))
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Spence, Edward; Classification of Hadamard matrices of order 24 and 28. Discrete Math. 140 (1995), no. 1-3, 185-243.
Wolfram, S. A New Kind of Science. Champaign, IL: Wolfram Media, p. 1073, 2002.
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