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References:
[1] Garrett BIRKHOFF: On the Structures of Abstract Algebras. Proc. Cambridge Philosophical Society 31 (1935), p. 433
[2] Philip M. WHITMAN: Lattices, Equivalence Relations, and Subgroups. Bull. Amer. Math. Soc. 52 (1946), p. 507 MR 0016750
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