Hereditary and cohereditary preradicals
Ladislav Bican, Pavel Jambor, Tomáš Kepka, Petr Němec (1976)
Czechoslovak Mathematical Journal
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Ladislav Bican, Pavel Jambor, Tomáš Kepka, Petr Němec (1976)
Czechoslovak Mathematical Journal
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Josef Jirásko (1979)
Commentationes Mathematicae Universitatis Carolinae
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Ladislav Bican, Pavel Jambor, Tomáš Kepka, Petr Němec (1974)
Commentationes Mathematicae Universitatis Carolinae
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Ladislav Bican, Pavel Jambor, Tomáš Kepka, Petr Němec (1979)
Mathematica Slovaca
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А.В. Сидоров (1989)
Algebra i Logika
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