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2. B. Ganter and R. Wille, Applied lattice theory: formal concept analysis, Appendix H in [4], pp. 591–605.
3. The complete congruence lattice of a complete lattice;Grätzer,1990
4. General Lattice Theory;Grätzer,1998
5. On complete congruence lattices of complete lattices;Grätzer;Trans. Amer. Math. Soc.,1991