%0 Journal Article %A S. S. Marchenkov %T Definability in the language of functional equations of a~countable-valued logic %J Diskretnaya Matematika %D 2013 %P 13-23 %V 25 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DM_2013_25_4_a1/ %G ru %F DM_2013_25_4_a1