TY  - JOUR
AU  - Pierre de la Harpe
AU  - A. Robertson
AU  - Alain Valette
TI  - On the spectrum of the sum of generators of a finitely generated group, II
JO  - Colloquium Mathematicum
PY  - 1993
SP  - 87
EP  - 87
VL  - 65
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-65-1-87/
DO  - 10.4064/cm-65-1-87
LA  - en
ID  - 10_4064_cm_65_1_87
ER  -