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@article{SF_1979__17_134309, author = {K. Byleen}, title = {Spirals of idemopotents from {P-semigroups.}}, journal = {Semigroup forum}, pages = {95--100}, publisher = {mathdoc}, volume = {17}, year = {1979}, zbl = {0398.20065}, url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134309/} }
K. Byleen. Spirals of idemopotents from P-semigroups.. Semigroup forum, Tome 17 (1979), pp. 95-100. http://geodesic.mathdoc.fr/item/SF_1979__17_134309/