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@article{DBLP:journals/ijbc/YuH09,
author = {Pei Yu and
Maoan Han},
title = {Critical Periods of Planar Revertible Vector Field with
Third-Degree Polynomial Functions},
journal = {I. J. Bifurcation and Chaos},
volume = {19},
number = {1},
year = {2009},
pages = {419-433},
ee = {http://dx.doi.org/10.1142/S0218127409022981},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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