@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},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1983_22_1_a1/}
}