The bicyclic semigroup has F4*.
Vachuska, C . ; Vachuska, P.
Semigroup forum, Tome 46 (1993), p. 133-134 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1993-01-01
EUDML-ID : urn:eudml:doc:135264 
@article{GDZPPN001262815,
     title = {The bicyclic semigroup has F4*.},
     journal = {Semigroup forum},
     volume = {46},
     year = {1993},
     pages = {133-134},
     zbl = {0793.20055},
     url = {http://dml.mathdoc.fr/item/GDZPPN001262815}
}

Vachuska, C .; Vachuska, P. The bicyclic semigroup has F4*.. Semigroup forum, Tome 46 (1993) pp. 133-134. http://gdmltest.u-ga.fr/item/GDZPPN001262815/