TY  - JOUR
AU  - Doković, D. Ž.
AU  - Check, P.
AU  - Hée, J.-Y.
TI  - On Closed Subsets of Root Systems
JO  - Canadian mathematical bulletin
PY  - 1994
SP  - 338
EP  - 345
VL  - 37
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1994-050-4/
DO  - 10.4153/CMB-1994-050-4
ID  - 10_4153_CMB_1994_050_4
ER  -