E. J. McCluskeyJr., Minimal sums for Boolean functions having many unspecified fundamental products. Switching circuit theory and logical design, Proceedings of the Second Annual Symposium, Detroit, Mich., October 17–20,1961, and papers from the First Annual Symposium, Chicago, III., October 9–14,1960, American Institute of Electrical Engineers, New York1961, pp. 10–17; also Transactions of the American Institute of Electrical Engineers, vol. 81 part 1 (1962), pp. 387–392.
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