1. Lattice-Ordered Groups: An Introduction;Anderson,1987
2. Totalgeordnete Moduln;Banaschewski;Arch. Math.,1956
3. Groupes et Anneaux Réticulés;Bigard,1977
4. Note on Hahn's theorem on ordered abelian groups;Clifford,1954
5. On ordered division rings;Conrad,1954