H. Wang, Z. Su, C. Liu, F. Meng, B. Song, and S. Zhang, “Nonlinear Vibration Analysis of Bearing-Rotor Systems with Ball Defects Considering Time-Varying Displacement Excitation”, SJT, vol. 8, no. 3, pp. 1–8, Mar. 2026, doi: 10.54691/whk6zh91.