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Sageev, G., Shelah, S. (1981). Weak compactness and the structure of Ext(A,ℤ). In: Göbel, R., Walker, E. (eds) Abelian Group Theory. Lecture Notes in Mathematics, vol 874. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0090527
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DOI: https://doi.org/10.1007/BFb0090527
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