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@article{DBLP:journals/combinatorica/Kriz89,
author = {Igor Kr\'{\i}z},
title = {A cycle-space invariant of the $<$2-distance-graph in the
plane},
journal = {Combinatorica},
volume = {9},
number = {1},
year = {1989},
pages = {103-105},
ee = {http://dx.doi.org/10.1007/BF02122690},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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