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Operations, homomorphism and update versus relational database systems
Communications in Mathematics, Tome 8 (2000) no. 1, pp. 99-109
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Classification : 03E20, 08A02, 08A70, 68P15 
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Fajmon, Břetislav. Operations, homomorphism and update versus relational database systems. Communications in Mathematics, Tome 8 (2000) no. 1, pp. 99-109. http://geodesic.mathdoc.fr/item/COMIM_2000_8_1_a9/

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