1. A fixed point theorem equivalent to the axiom of choice;Abian;Abstracts A.M.S.,1983
2. Seven propositions equivalent to Zermelo's theorem;Alas;Notices A.M.S.,1968
3. The axiom of choice and two particular forms of Tychonoff theorem;Alas;Portugal. Math.,1969
4. Une proposition équivalente au théorème de Zermelo;Alas;Proc. Japan Acad.,1970
5. Hahn-Banach extensions which are maximal on a given cone;Andenaes;Math. Ann.,1970