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Lajos, S. (1981). (m, n)-Ideal characterizations of certain classes of semigroups. In: Jürgensen, H., Petrich, M., Weinert, H.J. (eds) Semigroups. Lecture Notes in Mathematics, vol 855. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0089806
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DOI: https://doi.org/10.1007/BFb0089806
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