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@article{CMUC_1976__17_4_a7, author = {Be\v{c}v\'a\v{r}, Jind\v{r}ich}, title = {$K$-essential subgroups of abelian groups. {II.}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {693--707}, publisher = {mathdoc}, volume = {17}, number = {4}, year = {1976}, mrnumber = {0439952}, zbl = {0353.20042}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1976__17_4_a7/} }
Bečvář, Jindřich. $K$-essential subgroups of abelian groups. II.. Commentationes Mathematicae Universitatis Carolinae, Tome 17 (1976) no. 4, pp. 693-707. http://geodesic.mathdoc.fr/item/CMUC_1976__17_4_a7/