Characterizations of classes of left Ext-reproduced groups
Bulletin de la Société Mathématique de France, Tome 98 (1970), pp. 337-358. 
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     author = {Gr\"abe, P.J. and Viljoen, G.},
     title = {Characterizations of classes of left {Ext-reproduced} groups},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {337--358},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {98},
     year = {1970},
     doi = {10.24033/bsmf.1707},
     zbl = {0188.06601},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1707/}
}
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Gräbe, P.J.; Viljoen, G. Characterizations of classes of left Ext-reproduced groups. Bulletin de la Société Mathématique de France, Tome 98 (1970), pp. 337-358. doi : 10.24033/bsmf.1707. http://www.numdam.org/articles/10.24033/bsmf.1707/

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[3] Gräbe (P. J.). - Der iterierte Ext-Funktor, seine Periodizität und die dadurch definierten Klassen abelscher Gruppen, Studies on abelian groups, p. 131-141. Paris, Dunod ; Berlin, Springer-Verlag, 1968. | Zbl

[4] Gräbe (P. J.) and Viljoen (G.). - Maximal classes of Ext-reproduced abelian groups, Bull. Soc. math. France, t. 98, 1970, p. 165-192. | Numdam | MR | Zbl

[5] Harrison (D. K.). - Infinite abelian groups and homological methods, Annals of Math., t. 69, 1959, p. 366-391. | MR | Zbl

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