1. Differentiable Germs and Catastrophes;Bröcker,1975
2. Partially Ordered Rings and Semi-Algebraic Geometry;Brumfiel,1979
3. Partially Ordered Algebraic Systems;Fuschs,1963
4. Sugli ordinamenti di un campo estensione puramente trascendente di un campo ordinato;Massaza;Rend. Mat.,1968
5. Analysis of Real and Complex Manifolds;Narasimhan,1968