MathSciNet bibliographic data MR311657 (47 #219) 13G05 Jensen, C. U. On ${\rm Ext}\sp{1}\sb{R}(A,\,R)$${\rm Ext}\sp{1}\sb{R}(A,\,R)$ for torsion-free $A$$A$. Bull. Amer. Math. Soc. 78 (1972), 831–834. Article

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