TY  - JOUR
AU  - Vranch, J.
TI  - On Critical r, λ-Systems
JO  - Canadian mathematical bulletin
PY  - 1976
SP  - 217
EP  - 220
VL  - 19
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-034-2/
DO  - 10.4153/CMB-1976-034-2
ID  - 10_4153_CMB_1976_034_2
ER  -