1. On the structure of abstract algebras;Birkhoff;Proc. of the Cambridge Philosophical Society,1935
2. Lattice theory;Birkhoff;American Mathematical Society Colloquium Publications,1948
3. Distributive and modular laws in the arithmetic of relation algebras;Chin;University of California Publications in Mathematics,1951
4. Die Vollständigkeit der Axiome des logischen Funktionenkalküls;Gödel;Monatshefte für Mathematik und Physik,1930
5. Some equationally complete algebras;Kalicki;Bulletin of the American: Mathematical Society,1953