Injectives in certain classes of semigroups.
B.M. Schein (1974)
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B.M. Schein (1974)
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H. Jürgensen (1977/78)
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H. J. Weinert (1976/77)
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T.E. Hall, D.W.H. Gillam, N.H. Williams (1975)
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A Pollatchek (1976)
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C.A. Boyd (1975)
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F. Knowles (1974)
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John D. McCharen (1974)
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