@article{TRSPY_1964_72_a5,
     author = {N. N. Vorob'ev},
     title = {A~constructive calculus of statements with strong negation},
     journal = {Informatics and Automation},
     pages = {195--227},
     publisher = {mathdoc},
     volume = {72},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1964_72_a5/}
}