@article{DM_2013_25_4_a1,
     author = {S. S. Marchenkov},
     title = {Definability in the language of functional equations of a~countable-valued logic},
     journal = {Diskretnaya Matematika},
     pages = {13--23},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2013_25_4_a1/}
}