Garrett Birkhoff and Morgan Ward. A characterization of Boolean algebras. Annals of mathematics, ser. 2 vol. 40 (1939), pp. 609–610.
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1987 ◽
pp. 89-90
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1969 ◽
Vol 21
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pp. 884-894
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2006 ◽
pp. 129-134
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1975 ◽
Vol s2-12
(1)
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pp. 86-88
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1971 ◽
Vol 4
(2)
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pp. 163-178
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