1. On going down in polynomial rings;Dawson, Jeffrey;Canadian J. Math.,1974
2. Queen's Papers in Pure and Applied Mathematics, No. 12;Gilmer, Robert W.,1968
3. \bysame, Topics in commutative rings. II, University of Chicago, Chicago, Ill. (mimeographed notes).
4. Going down;McAdam, Stephen;Duke Math. J.,1972