@article{10_4064_fm178_3_4,
     author = {Krzysztof Ciesielski and Tomasz Natkaniec},
     title = {A big symmetric planar set with small
 category projections},
     journal = {Fundamenta Mathematicae},
     pages = {237--253},
     publisher = {mathdoc},
     volume = {178},
     number = {3},
     year = {2003},
     doi = {10.4064/fm178-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm178-3-4/}
}