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@article{SF_1993__46_1_135237, author = {C.M. Campbell and E.F. Robertson and R.M. Thomas}, title = {On a class of semigroups with symmetric presentations.}, journal = {Semigroup forum}, pages = {286--306}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0794.20063}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135237/} }
C.M. Campbell; E.F. Robertson; R.M. Thomas. On a class of semigroups with symmetric presentations.. Semigroup forum, Tome 46 (1993) no. 1, pp. 286-306. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135237/