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Cotorsion theories for Abelian groups. (English) Zbl 0426.20044
Gruppi abeliani e loro relazioni con la teoria dei moduli, Conv. Roma 1977, Symp. math. 23, 11-32 (1979).

MSC:
20K35 Extensions of abelian groups
20K40 Homological and categorical methods for abelian groups