@article{10_4064_fm204_3_1,
     author = {Gabriel Debs and Jean Saint Raymond},
     title = {Filter descriptive classes
of  {Borel} functions},
     journal = {Fundamenta Mathematicae},
     pages = {189--213},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {2009},
     doi = {10.4064/fm204-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm204-3-1/}
}