TY  - JOUR
AU  - JR., Kenneth D. Magill
TI  - Restrictive Semigroups of Closed Functions
JO  - Canadian journal of mathematics
PY  - 1968
SP  - 1215
EP  - 1229
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-117-x/
DO  - 10.4153/CJM-1968-117-x
ID  - 10_4153_CJM_1968_117_x
ER  -