1. The divisor class group of a semigroup ring;Anderson;Comm. Algebra,1980
2. Algèbre Commutative;Bourbaki,1961
3. Combinatorial invariance of Stanley-Reisner rings;Bruns;Georg. Math. J.,1996
4. W. Bruns, J. Gubeladze, N.V. Trung, Normal polytopes, triangulations and Koszul algebras, J. Für Reine Angew. Math., to appear.
5. Cohen-Macaulay Rings;Bruns,1993