1. Global Lorentzian Geometry;Beem,1981
2. The topology of Minkowski space;Zeeman;Topology,1967
3. Linear operators leaving invariant a cone in a Banach space;Krein;Translations Series 1, Vol. 10, Functional Analysis and Measure Theory, AMS (1962) (Original article in Russian: Uspehi Mat. Nauk. (N.S.),1948
4. Ordered Topological Vector Spaces;Peressini,1967
5. Introduction to the Theory of Partially Ordered Spaces;Vulikh,1967