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Acknowledgements
This work was supported by both the National Natural Science Foundation of China (Grant Nos. 11672020 and 11721202) and the Fundamental Research Funds for the Central Universities of China (No. YWF-16-JCTD-A-05).
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Liu, YY., Pan, C., Zhou, Y. et al. Visualization on vortical structures in the wake of a pair of pitching wings with asymmetrical motion. J Vis 23, 185–190 (2020). https://doi.org/10.1007/s12650-019-00616-y
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DOI: https://doi.org/10.1007/s12650-019-00616-y