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@article{MZM_1992_52_6_a9, author = {G. E. Puninskii}, title = {The pure-injective and $RD$-injective hulls of a ring}, journal = {Matemati\v{c}eskie zametki}, pages = {81--88}, publisher = {mathdoc}, volume = {52}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_52_6_a9/} }
G. E. Puninskii. The pure-injective and $RD$-injective hulls of a ring. Matematičeskie zametki, Tome 52 (1992) no. 6, pp. 81-88. http://geodesic.mathdoc.fr/item/MZM_1992_52_6_a9/