%0 Journal Article %A V. S. Proskurov %T A theorem on the coding of expressions in arbitrary languages %J Doklady Akademii Nauk %D 1970 %P 1021-1024 %V 194 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1970_194_5_a8/ %G ru %F DAN_1970_194_5_a8