TY  - JOUR
AU  - K. Chase
TI  - New semigroups of  binary relations.
JO  - Semigroup forum
PY  - 1979
SP  - 79
EP  - 82
VL  - 18
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1979__18_134342/
ID  - SF_1979__18_134342
ER  -