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@article{DBLP:journals/dm/Pretzel87,
author = {Oliver Pretzel},
title = {A non-covering graph of girth six},
journal = {Discrete Mathematics},
volume = {63},
number = {2-3},
year = {1987},
pages = {241-244},
ee = {http://dx.doi.org/10.1016/0012-365X(87)90012-4},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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