Geodesic
On the definition of purity of modules
Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 375-380.

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In the paper the coincidence is established of the concepts of “purity” and “bitriangular purity” in module theory, introduced in the book of A. P. Mishina and L. A. Skornyakov, Abelian Groups and Modules. 
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     author = {A. I. Generalov},
     title = {On the definition of purity of modules},
     journal = {Matemati\v{c}eskie zametki},
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     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a2/}
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A. I. Generalov. On the definition of purity of modules. Matematičeskie zametki, Tome 11 (1972) no. 4, pp. 375-380. http://geodesic.mathdoc.fr/item/MZM_1972_11_4_a2/