1. Orthocompletion of lattice groups;Bernau,1966
2. The SP-hull of a lattice-ordered group;Bleier;Canal. Jour. of Math.,1974
3. The representation and structure of lattice-ordered groups and f-rings;Chambless,1971
4. Lattice-ordered Groups;Conrad,1970
5. The hulls of representable l-groups and f-rings;Conrad;J. Austral. Math. Soc.,1973