%0 Journal Article %A G. S. Tseitin %T Three theorems on constructive functions %J Informatics and Automation %D 1964 %P 537-543 %V 72 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1964_72_a15/ %G ru %F TRSPY_1964_72_a15