1. Totalgeordnete Moduln;Banaschewski, Bernhard;Arch. Math.,1957
2. Lattice, ordered groups;Birkhoff, Garrett;Ann. of Math. (2),1942
3. \bysame, Lattice theory, rev. ed., Amer. Math. Soc. Colloq. Publ. Vol. 25, Amer. Math. Soc., Providence, R. I., 1948.
4. Note on Hahn’s theorem on ordered abelian groups;Clifford, A. H.;Proc. Amer. Math. Soc.,1954
5. Embedding theorems for abelian groups with valuations;Conrad, Paul F.;Amer. J. Math.,1953