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References:
[1] Cliffoгd A. H.: Arithmetìc and ideal theory of commutative semigroups. Ann. of Math., 39 (1938), 594-610.
[2] Skula L.: Divisorentheorie einer Halbgruppe. Math. Zeitschrift, 114 (1970), 113-120. MR 0262401 | Zbl 0177.03202
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