@article{BSMF_1970__98__165_0,
     author = {Gr\"abe, P.J. and Viljoen, G.},
     title = {Maximal classes of {Ext-reproduced} abelian groups},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {165--192},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {98},
     year = {1970},
     doi = {10.24033/bsmf.1698},
     mrnumber = {42 #363},
     zbl = {0188.06602},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.1698/}
}