TY  - JOUR
AU  - P.R. Jones
TI  - The Hopf property and K-free products of semigroups.
JO  - Semigroup forum
PY  - 1980
SP  - 343
EP  - 368
VL  - 20
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1980__20_134427/
ID  - SF_1980__20_134427
ER  -