On multi-Rees algebras. With an Appenddix by Ngô Viêt Trung. M. Herrmann; E. Hyry; J. Ribbe — 1995 Mathematische Annalen
On the Gorenstein property of form rings. M. Herrmann; J. Ribbe; P. Schenzel — 1993 Mathematische Zeitschrift
On the Cohen-Macaulay and Gorenstein properties of multigrad rees algebras. Manfred Herrmann; J. Ribbe; Eero Hyry — 1993 Manuscripta mathematica
Bounds for the multiplicity of almost complete intersections. M. Herrmann; J. Ribbe; N.V. Trung — 1991 Manuscripta mathematica