@article{10_4064_fm195_3_4,
     author = {M. Vanden Boom},
     title = {The effective {Borel} hierarchy},
     journal = {Fundamenta Mathematicae},
     pages = {269--289},
     publisher = {mathdoc},
     volume = {195},
     number = {3},
     year = {2007},
     doi = {10.4064/fm195-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm195-3-4/}
}