@article{TRSPY_1964_72_a15,
     author = {G. S. Tseitin},
     title = {Three theorems on constructive functions},
     journal = {Informatics and Automation},
     pages = {537--543},
     publisher = {mathdoc},
     volume = {72},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1964_72_a15/}
}