%0 Journal Article %A A. B. Khutoretskii %T Two existence theorems for computable numerations %J Algebra i logika %D 1969 %P 483-492 %V 8 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1969_8_4_a7/ %G ru %F AL_1969_8_4_a7