@article{AL_1977_16_5_a5,
     author = {V. I. Mart'yanov},
     title = {Universal extended theories of integers},
     journal = {Algebra i logika},
     pages = {588--602},
     year = {1977},
     volume = {16},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1977_16_5_a5/}
}