Some remarks on the four-spiral semigroup.
Lallement, G.
Semigroup forum, Tome 18 (1979), p. 341-346 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1979-01-01
EUDML-ID : urn:eudml:doc:134364 
@article{GDZPPN001253581,
     title = {Some remarks on the four-spiral semigroup.},
     journal = {Semigroup forum},
     volume = {18},
     year = {1979},
     pages = {341-346},
     zbl = {0428.20034},
     url = {http://dml.mathdoc.fr/item/GDZPPN001253581}
}

Lallement, G. Some remarks on the four-spiral semigroup.. Semigroup forum, Tome 18 (1979) pp. 341-346. http://gdmltest.u-ga.fr/item/GDZPPN001253581/