@article{VMUMM_1984_4_a0,
     author = {V. N. Krivtsov},
     title = {Deductive potentialities of the negationless predicate calculus},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--5},
     year = {1984},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_4_a0/}
}