1. Valuation fans and residually real closed Henselian fields;Becker;J. Algebra,1999
2. Hereditarily–Pythagorean Fields and Orderings of Higher Level;Becker,1978
3. Summen n-ter Potenzen in Körpern;Becker;J. Reine Angew. Math.,1979
4. Partial orders on a field and valuation rings;Becker;Comm. Algebra,1979
5. The real holomorphy ring and sums of 2nth powers;Becker,1982