TY  - JOUR
AU  - J.D. Lawson
AU  - M. Mislove
TI  - Semilattices which must contain a copy of  2 N.
JO  - Semigroup forum
PY  - 1985
SP  - 71
EP  - 78
VL  - 32
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1985__32_134768/
ID  - SF_1985__32_134768
ER  -