One example concerning testing categories
Jiří Rosický (1977)
Commentationes Mathematicae Universitatis Carolinae
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Jiří Rosický (1977)
Commentationes Mathematicae Universitatis Carolinae
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Věra Trnková (1970)
Commentationes Mathematicae Universitatis Carolinae
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Jiří Rosický (1975)
Czechoslovak Mathematical Journal
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