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NDVI-Based Spatial-Temporal Change in Grassland Growth of China from 1982 to 2010
LIANG Shuang,PENG Shushi, LIN Xin, CONG Nan
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Linear Estimation of the Number of Zeros of Abelian Integrals for Cubic Isochronous Centers
LIANG Shuang
Acta Scientiarum Naturalium Universitatis Pekinensis
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It is studied that the number of limit cycles that bifurcate from the periodic orbit of cubic isorhronous centers, formed by conics, when perturbing such systems inside the class of all polynomial systems of degree
n
.
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