Identities for direct decomposability of congruences can be written in two variables
Commentationes Mathematicae Universitatis Carolinae, Tome 28 (1987) no. 4.

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Classification : 11D79
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     title = {Identities for direct decomposability of congruences can be written in two variables},
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Duda, Jaromír. Identities for direct decomposability of congruences can be written in two variables. Commentationes Mathematicae Universitatis Carolinae, Tome 28 (1987) no. 4. http://geodesic.mathdoc.fr/item/CMUC_1987__28_4_a16/