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@article{Authenticus:P-00N-MDT,
	title = {{Generalized varieties of commutative and nilpotent semigroups}},
	author = {J Almeida and NR Reilly},
	doi = {10.1007/bf02573439},
	journal = {Semigroup Forum},
	number = {1},
	pages = {77-98},
	publisher = {Springer-Verlag},
	type = {Article},
	volume = {30},
	year = {1984}
}