Geodesic
The universal theory of the integers and the extended twin
Algebra i logika, Tome 22 (1983) no. 1, pp. 26-34 
E. B. Belyakov; V. I. Mart'yanov. The universal theory of the integers and the extended twin. Algebra i logika, Tome 22 (1983) no. 1, pp. 26-34. http://geodesic.mathdoc.fr/item/AL_1983_22_1_a1/
@article{AL_1983_22_1_a1,
     author = {E. B. Belyakov and V. I. Mart'yanov},
     title = {The universal theory of the integers and the extended twin},
     journal = {Algebra i logika},
     pages = {26--34},
     year = {1983},
     volume = {22},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1983_22_1_a1/}
}
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