One example concerning testing categories
Commentationes Mathematicae Universitatis Carolinae, Tome 18 (1977) no. 1, pp. 71-75.

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Classification : 18A35, 18B15
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     title = {One example concerning testing categories},
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Rosický, Jiří. One example concerning testing categories. Commentationes Mathematicae Universitatis Carolinae, Tome 18 (1977) no. 1, pp. 71-75. http://geodesic.mathdoc.fr/item/CMUC_1977__18_1_a6/