Varieties generated by semigroups of order four.
Semigroup forum, Tome 21 (1980), pp. 67-82.

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@article{SF_1980__21_134435,
     author = {C.C. Edmunds},
     title = {Varieties generated by semigroups of order four.},
     journal = {Semigroup forum},
     pages = {67--82},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0449.20060},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134435/}
}
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C.C. Edmunds. Varieties generated by semigroups of order four.. Semigroup forum, Tome 21 (1980), pp. 67-82. http://geodesic.mathdoc.fr/item/SF_1980__21_134435/