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@article{DBLP:journals/apal/Veldman05,
author = {Wim Veldman},
title = {Two simple sets that are not positively Borel},
journal = {Ann. Pure Appl. Logic},
volume = {135},
number = {1-3},
year = {2005},
pages = {151-209},
ee = {http://dx.doi.org/10.1016/j.apal.2004.12.004},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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