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@article{SF_1991__43_3_135108, author = {P.A. Grillet}, title = {Nilsemigroups on trees.}, journal = {Semigroup forum}, pages = {187--201}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0744.20050}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135108/} }
P.A. Grillet. Nilsemigroups on trees.. Semigroup forum, Tome 43 (1991) no. 3, pp. 187-201. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135108/