@article{10_4064_fm_143_2_179_181,
     author = {R. Kaufman},
     title = {Extreme points and descriptive sets},
     journal = {Fundamenta Mathematicae},
     pages = {179--181},
     publisher = {mathdoc},
     volume = {143},
     number = {2},
     year = {1993},
     doi = {10.4064/fm-143-2-179-181},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-143-2-179-181/}
}