TY  - JOUR
TI  - Addendum
JO  - Canadian journal of mathematics
PY  - 1990
SP  - 1131
EP  - 1131
VL  - 42
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1990-060-7/
DO  - 10.4153/CJM-1990-060-7
ID  - 10_4153_CJM_1990_060_7
ER  -