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P. Crawley and R. P. Dilworth, Algebraic theory of lattices,
Prentice-Hall, Englewood Cliffs, New Jersey, 1973.
R. Freese and J. B. Nation, Congruence lattices of semilattices, Pacific
J. Math. 49 (1973), 51-58.
Wed May 1 14:43:43 HST 1996