1. D. F.Anderson and D. E.Dobbs, Fields in which seminormality implies normality. Houston J. Math., to appear.
2. A. Andreotti andE. Bombieri, Sugli omeomorfismi delle varietá algebriche. Ann. Scuola Norm. Sup. Pisa23, 431?450 (1969).
3. D. E. Dobbs, On seminormal subrings. Math. Japon.32, 11?15 (1987).
4. D. E. Dobbs, Going-down underrings. Bull. Austral. Math. Soc.36, 503?513 (1987).
5. D. E. Dobbs andM. Fontana, Universally going-down homomorphisms of commutative rings. J. Algebra90, 410?429 (1984).