@article{105711, author = {Jind\v rich Be\v cv\'a\v r}, title = {$K$-essential subgroups of abelian groups. I}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {017}, year = {1976}, pages = {481-492}, zbl = {0344.20042}, mrnumber = {0439951}, language = {en}, url = {http://dml.mathdoc.fr/item/105711} }
Bečvář, Jindřich. $K$-essential subgroups of abelian groups. I. Commentationes Mathematicae Universitatis Carolinae, Tome 017 (1976) pp. 481-492. http://gdmltest.u-ga.fr/item/105711/
Infinite abelian groups I, Acad. Press 1970. (1970) | MR 0255673
Infinite abelian groups II, Acad. Press 1973. (1973) | MR 0349869
Ob $N$-vysokich podgruppach abelevoj gruppy, Vest. Mosk. Univ. 1 (1975), 58~64. (1975) | MR 0399308
Ein Analogon der Körpertheorie für abelsche Gruppen, J. Reine Angew. Math. 188 (1950), 167-192. (1950) | MR 0049185 | Zbl 0054.01003