1. On the real spectrum of a ring and its application to semi-algebraic geometry;Becker;Bull. Amer. Math. Soc.,1986
2. Algèbre Commutative;Bourbaki,1961
3. Real spectra and distributions of signatures;Bröcker,1982
4. Partially Ordered Rings and Semi-Algebraic Geometry;Brumfiel,1979
5. Some open problems;Brunfiel;Contemporary Math.,1982