@article{AL_2004_43_6_a2,
     author = {W. Calvert and D. Cummins and J. F. Knight and S. Miller},
     title = {Comparing {Classes} of {Finite} {Structures}},
     journal = {Algebra i logika},
     pages = {666--701},
     publisher = {mathdoc},
     volume = {43},
     number = {6},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2004_43_6_a2/}
}