TY  - JOUR
AU  - R.M. Capocelli
TI  - On optimal factorization of free semigroups into free subsemigroups.
JO  - Semigroup forum
PY  - 1980
SP  - 199
EP  - 212
VL  - 19
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1980__19_134383/
ID  - SF_1980__19_134383
ER  -