@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/}
}