Gratzer, G. The congruences of a finite lattice: A proof-by-picture approach.
Chicago-referens (17:e uppl.)Gratzer, George. The Congruences of a Finite Lattice: A Proof-by-picture Approach.
MLA-referens (8:e uppl.)Gratzer, George. The Congruences of a Finite Lattice: A Proof-by-picture Approach.
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