POINCARÉ-CARTAN INTEGRAL INVARIANTS OF BIRKHOFFIAN SYSTEMS
郭永新;尚玫;罗绍凯
POINCARÉ-CARTAN INTEGRAL INVARIANTS OF BIRKHOFFIAN SYSTEMS
GUO Yong-xin;SHANG Mei;LUO Shao-kai
Applied Mathematics and Mechanics (English Edition) . 2003, (1): 68 -72 . 

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