TY  - JOUR
AU  - H.J. SHYR
TI  - Some Free Submonoids of the Free Monoid of Prefix Codes.
JO  - Semigroup forum
PY  - 1975
SP  - 22
EP  - 29
VL  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1975__11_186352/
ID  - SF_1975__11_186352
ER  -