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@article{Authenticus:P-001-R93,
	title = {{On the Membership Problem For Pseudovarieties of Commutative Semigroups}},
	author = {J ALMEIDA},
	doi = {10.1007/bf02573404},
	journal = {Semigroup Forum},
	number = {1},
	pages = {47-51},
	publisher = {Springer Verlag},
	type = {Article},
	volume = {42},
	year = {1991}
}