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    1. huang, z., & zhang, x. (2019). acoustic absorption properties of foamed materials for high-speed trains.
    2. wang, y., & li, h. (2020). application of reactive foaming catalysts in magnetic levitation trains.
    3. kim, j., & park, s. (2021). vibration isolation performance of foamed materials in train connections.
    4. li, q., et al. (2022). optimization of foaming catalyst formulations for enhanced acoustic performance.
    5. schmidt, a., & m¨¹ller, r. (2021). smart vibration control systems for magnetic levitation trains.

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