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@article{DBLP:journals/jsyml/Velleman90,
author = {Dan Velleman},
title = {Partitioning Pairs of Countable Sets of Ordinals},
journal = {J. Symb. Log.},
volume = {55},
number = {3},
year = {1990},
pages = {1019-1021},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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