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Abstract and Applied Analysis
Volume 2013 (2013), Article ID 762751, 8 pages
Limit Cycles and Isochronous Centers in a Class of Ninth Degree System
1School of Science, Linyi University, Linyi, Shandong 276005, China
2School of Science, Shaoyang University, Shaoyang, Hunan 422000, China
Received 15 April 2013; Accepted 3 October 2013
Academic Editor: Ruediger Landes
Copyright © 2013 Li Hongwei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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