1. T. Asanuma, D-algebras which are D-stably equivalent to D[X], preprint.
2. Seminormalita e singolarita ordinarie;Bombieri,1973
3. Commutative Algebra;Bourbaki,1972
4. J. Brewer and D. Costa, Seminormality and projective modules over polynomial rings, preprint.
5. Multiplicative Ideal Theory;Gilmer,1972