1. G.M. Bergman, Von Neumann regular rings with tailor-made ideal lattices, unpublished note, 26 October 1986
2. Lattice Theory;Birkhoff,1948
3. Representations of lattices by sets;Birkhoff;Trans. Amer. Math. Soc.,1948
4. The Dilworth Theorems. Selected Papers of Robert P. Dilworth,1990
5. Congruence lattices of algebras of fixed similarity type. I;Freese;Pacific J. Math.,1979