TY  - JOUR
AU  - Robert Bieri
AU  - Burkhardt Renz
TI  - Valuations on free resolutions and higher geometric invariants of groups.
JO  - Commentarii mathematici Helvetici
PY  - 1988
SP  - 464
EP  - 497
VL  - 63
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1988__63_4_140130/
ID  - CMH_1988__63_4_140130
ER  -