@article{VMUMM_1998_2_a2,
     author = {R. \`E. Yavorskii},
     title = {Predicate logics for decidable fragments of arithmetic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {12--16},
     year = {1998},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1998_2_a2/}
}