@article{AL_2005_44_5_a3,
     author = {E. A. Palyutin},
     title = {Stably {Definable} {Classes} of {Theories}},
     journal = {Algebra i logika},
     pages = {583--600},
     publisher = {mathdoc},
     volume = {44},
     number = {5},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2005_44_5_a3/}
}