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., 234 24 (2026) 7671-7683DOI: https://doi.org/10.1140/epjs/s11734-025-01757-y