1. http://www.dcs.shef.ac.uk/~georg/ka
2. Prover9 and Mace4,
http://www.cs.unm.edu/~mccune/prover9
3. Waldmeister,
http://www.waldmeister.org
4. Birkhoff, G.: Lattice Theory. Colloquium Publications, vol. 25. American Mathematical Society (reprint, 1984)
5. Lecture Notes in Computer Science;J.-L. Carufel De,2006