@article{VMUMM_1989_6_a16,
     author = {N. A. Pankrat'ev},
     title = {The disjunction property and {Church's} thesis in arithmetic with {Grzegorczyk} logic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {63--65},
     publisher = {mathdoc},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_6_a16/}
}