TY  - JOUR
AU  - Kannappan, Pl.
AU  - Taylor, M. A.
TI  - On Closure Conditions
JO  - Canadian mathematical bulletin
PY  - 1976
SP  - 291
EP  - 296
VL  - 19
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-045-6/
DO  - 10.4153/CMB-1976-045-6
ID  - 10_4153_CMB_1976_045_6
ER  -