TY  - JOUR
TI  - Announcement
JO  - Canadian mathematical bulletin
PY  - 1968
SP  - 525
EP  - 525
VL  - 11
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0008439500029829/
DO  - 10.1017/S0008439500029829
ID  - 10_1017_S0008439500029829
ER  -