1. N. Fine, L. Gillman, and J. Lambek, Rings of quotients of rings of functions, (McGill Univ. Press), Montreal, 1965.
2. L. Gillman and M. Jerson, Rings of continuous functions, 1960.
3. A. M. Gleason, Projective topological spaces, Illinois J. Math., 12 (1958), 482–489.
4. H. Gonshor, Injective hulls of C* algebras II, Proc. Amer. Math. Soc., 24 (1970), 486–491.
5. H. Gonshor, Projective covers as subquotients of enlargements, accepted by Israel J. Math.