Integrated permanent-magnet-based quasi-zero stiffness low-frequency vibration isolator with nonlinear boundary constraintsQiong Lin, Xiaoyan Wang, Zhengzheng Wang, Zhenyu Ding, Jun Zhu, Gaoxiang Shen and Huaping WuEur. Phys. J. Spec. Top., (2025) 1-13DOI: https://doi.org/10.1140/epjs/s11734-025-01757-y