1. V. Adams, P. Loustanau, An Introduction to Gröbner Bases. Graduate Studies in Mathematics 3, American Mathematical Society, Providence, RI, (1994).
2. J. A. Alonso and E. Briales, Lógicas Polivalentes y Bases de Gröbner. Procs. of the V Congress on Natural Languages and Formal Languages, Ed. M. Vide, Barcelona, (1989), 307–315.
3. B.G. Buchanan and E.H. Shortliffe, Rule Based Expert Systems: The MYCIN experiments of the Stanford Heuristic Programming Project. Addison-Wesley, Reading, MA. (1984).
4. S. Bernstein, J. Kahan, Personal communication. RAND Corporation (1993).
5. A. Capani and G. Niesi, CoCoA User’s Manual (v. 3.0b). Dept. of Mathematics, University of Genova (1996).