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Communicated by G. Lallement
Dedicated to Professor L. M. Gluskin on his Sixtieth Birthday
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Tamura, T. Nil-orders of commutative nil-bounded semigroups. Semigroup Forum 24, 255–262 (1982). https://doi.org/10.1007/BF02572771
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DOI: https://doi.org/10.1007/BF02572771