TY  - JOUR
AU  - J. Pym
TI  - Affine semigroups and second duals.
JO  - Semigroup forum
PY  - 1993
SP  - 130
EP  - 132
VL  - 47
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1993__47_2_135263/
ID  - SF_1993__47_2_135263
ER  -