Chin. Phys. B
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Chin. Phys.  2007, Vol. 16 Issue (3): 582-587    DOI: 10.1088/1009-1963/16/3/004
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The discrete variational principle and the first integrals of Birkhoff systems
Gu Shu-Longa, Liu Chuan-Zhanga, Zhang Hong-Binb, Chen Li-Qunc
a Department of Physics, Chaohu College, Chaohu 238000, China; b Department of Physics, Chaohu College, Chaohu 238000, China;Shanghai Institute of Mathematics and Mechanics, Shanghai University, Shanghai 200072, China; c Shanghai Institute of Mathematics and Mechanics, Shanghai University, Shanghai 200072, China;Department of Mechanics, Shanghai University, Shanghai 200436, China

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