@article{10_4064_fm170_1_2,
     author = {Greg Hjorth and Alexander S. Kechris},
     title = {Recent developments in the theory of {Borel} reducibility},
     journal = {Fundamenta Mathematicae},
     pages = {21--52},
     publisher = {mathdoc},
     volume = {170},
     number = {1},
     year = {2001},
     doi = {10.4064/fm170-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm170-1-2/}
}