TY  - JOUR
AU  - G. Lallement
TI  - Some remarks on the four-spiral semigroup.
JO  - Semigroup forum
PY  - 1979
SP  - 341
EP  - 346
VL  - 18
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SF_1979__18_134364/
ID  - SF_1979__18_134364
ER  -