TY  - JOUR
AU  - H.J. Shyr
TI  - A characterization of dense languages.
JO  - Semigroup forum
PY  - 1984
SP  - 237
EP  - 240
VL  - 30
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1984__30_134720/
ID  - SF_1984__30_134720
ER  -