Sum of categories with amalgamated subcategory
Věra Trnková (1965)
Commentationes Mathematicae Universitatis Carolinae
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Věra Trnková (1965)
Commentationes Mathematicae Universitatis Carolinae
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Věra Trnková (1966)
Commentationes Mathematicae Universitatis Carolinae
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Kučera, L., Pultr, A.
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