Geodesic
Non-perfect rings and a theorem of Eklof and Shelah
Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 1, pp. 27-32

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We prove a stronger form, $A^+$, of a consistency result, $A$, due to Eklof and Shelah. $A^+$ concerns extension properties of modules over non-left perfect rings. We also show (in ZFC) that $A$ does not hold for left perfect rings.
Classification : 03E55, 16A50, 16A51, 16D40, 16L30
Keywords: perfect ring; Ext; uniformization 
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Trlifaj, Jan. Non-perfect rings and a theorem of Eklof and Shelah. Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 1, pp. 27-32. http://geodesic.mathdoc.fr/item/CMUC_1991__32_1_a3/