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References
Reilly, Norman R. and Shuhua Zhang,Operators and Products in the Lattice of Existence Varieties of Regular Semigroups, Semigroup Forum53 (1996), 1–24.
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Communicated by F. Pastijn
The online version of the original article can be found at http://dx.doi.org/10.1007/BF02574117
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Reilly, N.R., Zhang, S. Operators and products in the lattice of existence varieties of regular semigroups. Semigroup Forum 53, 270 (1996). https://doi.org/10.1007/BF02574142
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DOI: https://doi.org/10.1007/BF02574142