1. A remark on Piron's paper;Amemiya;Publ. Res. Inst. Math. Sci. Ser. A,1967
2. Lattice Theory;Birkhoff,1967
3. Residuated mappings;Derdérian;Pacific J. Math.,1967
4. A mathematical foundation for empirical sciences with special reference to quantum theory, Part I, A calculus of experimental propositions;Randall;Knolls Atomic Power Lab. Report KAPL-3147,1966