References
- Andradas , C. , Bröcker , L. and Ruiz , J. 1996 . Constructible Sets in Real Geometry Berlin : Springer .
- Bochnak , J. , Coste , M. and Roy , M-F. 1985 . Géométrie algébrique réelle Berlin : Springer .
- Brumfiel , G. 1979 . Partially Ordered Rings and Semi-Algebraic Geometry Cambridge : Cambridge University Press .
- Lang , S. 1993 . Algebra , 3 Addison-Wesley .
- McEnerney , J. and Stengle , G. 1997 . The Nonreduced Order Spectrum of a Commutative Ring Vol. 10 , Revista mathematica, numero Suplementario
- McEnerney , J. , Robson , R. and Stengle , G. 1999 . Convex Polarities Over Ordered Fields Preprint
- Prenowitz , W. and Jantosciak , J. 1979 . Join Geometries, A Theory of Convex Sets and Linear Geometry New York : Springer-Verlag .
- Stoer , J. and Witzgall , C. 1970 . Convexity and Optimization in Finite Dimensions I Berlin : Springer .
- Weispfenning , V. 1988 . The complexity of linear problems in fields . J. Symbolic Computation , 5 ( 1 ) : 3 – 27 .
- Ziegler , G. 1995 . Lectures on Polytopes Berlin : Springer .