@article{GDZPPN001254669,
title = {Regular 4-spiral semigroup, I.G. semigroups and the Rees construction.},
journal = {Semigroup forum},
volume = {23},
year = {1981},
pages = {97-100},
zbl = {0463.20043},
url = {http://dml.mathdoc.fr/item/GDZPPN001254669}
}
Byleen, K. Regular 4-spiral semigroup, I.G. semigroups and the Rees construction.. Semigroup forum, Tome 23 (1981) pp. 97-100. http://gdmltest.u-ga.fr/item/GDZPPN001254669/