1. W. Bruns, W. and Vetter, U.: Determinantal rings. Lect. Notes Math.1327, Springer 1988
2. De Concini, C., Eisenbud, D., and Procesi, C.: Hodge algebras. Astérisque91, 1982
3. Eisenbud, D.: Introduction to algebras with straightening laws. In: McDonald, B. R. (Ed.), Ring theory and algebra III, M. Dekker, 1980, pages 243–267
4. Flenner, H.: Quasi-homogene rationale Singularitäten. Arch. Math.36, 35–44 (1981)
5. Gräbe, H.-G.: Streckungsringe. Dissertation B, Erfurt/Mühlhausen, 1988