1. Becker, E.: Hereditarily pythagorean fields and orderings of higher level. IMPA Lecture Notes, No. 29 (1978), Rio de Janeiro.
2. Becker, E.: Summen n-ter Potenzen in Körpern, J. reine angew. Mathematik 307/308 (1979), 8–30.
3. Becker, E.: Partial orders on a field and valuation rings, Comm. Alg. 7 (1979), 1933–1976.
4. Becker, E.: Valuations and real places in the theory of formally real fields, these Proceedings.
5. Becker, E. and Harman, J. and Rosenberg, A.: Signatures of fields and extension theory, J. reine angew. Mathematik, to appear.