00409nam a2200145Ia 4500008004100000020001500041082001400056100002500070245005600095260004800151300000800199650001600207650001800223653002200241170901s1979    xx            000 0 und d  a052122845X  a516bB92P  aBrumfiel, Gregory W. 0aPartially Ordered Rings and Semi-Algebraic Geometry  aCambridgebCambridge University Pressc1979  a280  aMathematics  aPure Sciences  aAlgebric geometry