Geodesic
On classes of groupoids of relations with diophantine operations
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 4, pp. 28-34.

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In the paper the bases of identities of varieties generated by classes of groupoids of the binary relations with diophantine operations are found. 
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D. A. Bredikhin. On classes of groupoids of relations with diophantine operations. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 13 (2013) no. 4, pp. 28-34. http://geodesic.mathdoc.fr/item/ISU_2013_13_4_a2/

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