1. B. Banaschewski,Injectivity and essential extensions in equational classes of algebras, Proceedings of the Conference on Universal Algebra (October 1969), Queen's Papers in Pure and Applied Mathematics25 (1970), 131–147.
2. B. Banaschewski,Profinite Universal Algebras, Proceedings of the Third Topology Symposium, Prague 1971, 51–62
3. B. Banaschewski,Equational compactuess of G-sets, Can. Math. Bull. (to appear).
4. B. Banaschewski and Evelyn Nelson.Equational compactness in equational classes of algebras, Algebra Universalis2 (1972), 152–165
5. N. Bourbaki,General Topology, Addison-Wesley, Reading, Mass. 1966.