Semigroups and Their Applications: Proceedings of the ...
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I. A. Amin, R. Wiegandt: "Torsion and torsionfree classes of acts." Contićbutions to Gonohać. Aćgobha 2, Proc. Klagenfurt Conf. 1982. Wien, Stuttgart, 1983; 19-34. 2. E. Fried, R. Wiegåndt: "Abstract relational Structures, II (Torsion theory).