@article{IM2_2003_67_1_a3,
     author = {V. G. Kanovei and M. Reeken},
     title = {Some new results on {Borel} irreducibility of equivalence relations},
     journal = {Izvestiya. Mathematics },
     pages = {55--76},
     publisher = {mathdoc},
     volume = {67},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2003_67_1_a3/}
}