Chin. Phys. B
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Chin. Phys.  2006, Vol. 15 Issue (5): 895-898    DOI: 10.1088/1009-1963/15/5/002
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Direct method of finding first integral of two-dimensional autonomous systems in polar coordinates
Wang Wen-Longa, Lou Zhi-Meib
a Department of Mathematics, Shaoxing College of Arts and Sciences, Shaoxing 312000, China; b Department of Physics, Shaoxing College of Arts and Sciences, Shaoxing 312000, China

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