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Communicated by B. M. Schein
Dedicated to Stan and Francoise Ulam
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Baird, B.B., Magill, K.D. Green's ℒ-relation for generalized polynomials. Semigroup Forum 22, 9–45 (1981). https://doi.org/10.1007/BF02572782
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DOI: https://doi.org/10.1007/BF02572782