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3. Birkhoff and MacLane, “A Survey of Modern Algebra,” MacMillan Company, 1965.
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5. E. F. Brickell, J. A. Davis, and G. J. Simmons, “A Preliminary Report on the Crypt-analysis of the Merkle-Hellman Knapsack Cryptosystems”, Advances in Cryptology, Proc. Crypto 82, Santa Barbara, California, U. S. A, August 23 – 25, 1982, Plenum Press, New York, 1983, pp. 289 – 301.