@article{VMUMM_1988_6_a20,
     author = {A. A. Kuzichev and A. S. Kuzichev},
     title = {A conservative extension of a formal arithmetic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {77--78},
     publisher = {mathdoc},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_6_a20/}
}