1. Demi-groupes Inversifs;Croisot;Ann. Sci. Ecole Normale Sup.,1953
2. Inverses in Euclidean Mobs;Wallace;Math. J. Okayama Univ.,1953
3. The Structure of Topological Semigroups;Wallace;Bull. Am. Math. Soc.,1955
4. A Note on Mobs;Wallace;Anais Acad. Brasil. Ci.,1953
5. Cohomology, Dimension and Mpbs;Wallace;Summa Brasil. Math.,1953