1. An algebraically simple ordered group;Chehata,1952
2. Valuation Theory;Endler,1972
3. Homomorphismen projektiver Räume und Hjelmslevsche Geometrie;Mathiak;J. Reine Angew. Math.,1972
4. On ordered division rings;Neumann;Amer. Math. Soc. Trans.,1949
5. Non-injective collineations;Radó;Aequationes math.,1970