@article{IM2_1988_30_1_a5,
     author = {A. A. Tverskoi},
     title = {Nonconstructivizable formal arithmetic structures},
     journal = {Izvestiya. Mathematics },
     pages = {103--122},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1988_30_1_a5/}
}