-essential subgroups of abelian groups. I
Jindřich Bečvář (1976)
Commentationes Mathematicae Universitatis Carolinae
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Jindřich Bečvář (1976)
Commentationes Mathematicae Universitatis Carolinae
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Commentationes Mathematicae Universitatis Carolinae
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Jindřich Bečvář (1976)
Commentationes Mathematicae Universitatis Carolinae
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