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ACTA issues
87:3-4(2021)
87:1-2(2021)
86:3-4(2020)
86:1-2(2020)
85:3-4(2019)
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11:4-4(1946-48)
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10:3-4(1941-43)
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9:4-4(1938-40)
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Characterizations of some classes of semigroups
Gy. Pollák, O. Steinfeld
Acta Sci. Math. (Szeged)
47:1-2(1984), 55-59
5066/2009