1. Semi-algebras of continuous functions;Bonsall,1960
2. Semi-algebras of continuous functions;Bonsall,1960
3. Type 2 semi-algebras of continuous functions;Bonsall,1962
4. Stability of wedges and semi-algebras;Brown,1968
5. Masstheoretische Kennzeichnung gewisser Funktionenkegel;Guber;Arch. Math.,1964