1. Lattice Theory;Birchoff,1968
2. Théorie des Ensembles;Bourbaki,1970
3. Fuzzy games and their minimax theorem (in Romanian);Butnariu;St. Cerc. Math.,1976
4. D. Butnariu, Equilibrium points in fuzzy games (in Romanian) St. Cerc. Math. (to appear).
5. (L',L)-Fuzzy topological spaces;Butnariu;Anats Sci. Univ. “Al. I. Cuza”-Iasi 23 Seria I,1977