Geodesic
On the membership problem for pseudo-varieties of commutative semigroups.
Semigroup forum, Tome 42 (1991) no. 3, pp. 47-52.

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Mots-clés : pseudovariety of finite commutative semigroups, finite basis of pseudoidentities, permutative pseudovariety, membership problem, polynomial time 
@article{SF_1991__42_3_135062,
     author = {J. Almeida},
     title = {On the membership problem for pseudo-varieties of commutative semigroups.},
     journal = {Semigroup forum},
     pages = {47--52},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     zbl = {0728.20050},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135062/}
}
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J. Almeida. On the membership problem for pseudo-varieties of commutative semigroups.. Semigroup forum, Tome 42 (1991) no. 3, pp. 47-52. http://geodesic.mathdoc.fr/item/SF_1991__42_3_135062/