@article{AL_1992_31_4_a6,
     author = {N. A. Serdyukova},
     title = {On purities of abelian groups},
     journal = {Algebra i logika},
     pages = {434--446},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1992_31_4_a6/}
}