Approximate Lie Symmetries, Approximate Noether Symmetries and Approximate Mei Symmetries of Typical Perturbed Mechanical System
LOU Zhimei, WANG Yuanbin, XIE Zhikun
Acta Scientiarum Naturalium Universitatis Pekinensis . 2016, (4): 681 -686 .  DOI: 10.13209/j.0479-8023.2016.080

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