TY  - JOUR
AU  - N. Hindman
AU  - J. Pym
TI  - Closure of singly generated subsemigroups of  S.
JO  - Semigroup forum
PY  - 1991
SP  - 147
EP  - 154
VL  - 42
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1991__42_3_135073/
ID  - SF_1991__42_3_135073
ER  -