@article{10_4064_fm_71_3_187_191,
     author = {Stephen Willard},
     title = {Some examples in the theory of {Borel} sets},
     journal = {Fundamenta Mathematicae},
     pages = {187--191},
     publisher = {mathdoc},
     volume = {71},
     number = {3},
     year = {1971},
     doi = {10.4064/fm-71-3-187-191},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-71-3-187-191/}
}