@article{AL_2011_50_2_a3,
     author = {A. G. Pinus},
     title = {New algebraic invariants for definable subsets in universal algebra},
     journal = {Algebra i logika},
     pages = {209--230},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2011_50_2_a3/}
}