Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1982__24_134547, author = {P.R. Jones}, title = {A graphical representation for the free product of {E-unitary} inverse semigroups.}, journal = {Semigroup forum}, pages = {195--222}, publisher = {mathdoc}, volume = {24}, year = {1982}, zbl = {0486.20035}, url = {http://geodesic.mathdoc.fr/item/SF_1982__24_134547/} }
P.R. Jones. A graphical representation for the free product of E-unitary inverse semigroups.. Semigroup forum, Tome 24 (1982), pp. 195-222. http://geodesic.mathdoc.fr/item/SF_1982__24_134547/