Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1964__68_177253, author = {Z. Hedrlin and A. Pultr}, title = {Relations {(Graphs)} with {Given} {Finitely} {Generated} {Semigroups.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {213--217}, publisher = {mathdoc}, volume = {68}, year = {1964}, zbl = {0126.26602}, url = {http://geodesic.mathdoc.fr/item/MOMA_1964__68_177253/} }
Z. Hedrlin; A. Pultr. Relations (Graphs) with Given Finitely Generated Semigroups.. Monatshefte für Mathematik, Tome 68 (1964), pp. 213-217. http://geodesic.mathdoc.fr/item/MOMA_1964__68_177253/