1. Colloquium semi-algebras and positive operators (in Dutch;Bart;Mathematical Centre Syllabus,1971
2. Locally compact semi-algebras;Bonsall;Proc. London Math. Soc.,1963
3. Compact linear operators from an algebraic standpoint;Bonsall;Glasgow Math. J.,1967
4. The semi-algebra generated by a compact linear operator;Bonsall;Proc. Edinburgh Math. Soc.,1965
5. Idempotents of compact monothetic semigroups;Brown;Proc. London Math. Soc.,1971