Hopf bifurcation control of nonlinear electromechanical coupling main drive system of rolling millShuang Liu, Hongling Ai, Zhenfang Pang, Zhenjun Lin and Dingxuan ZhaoEur. Phys. J. Plus, 135 4 (2020) 365DOI: https://doi.org/10.1140/epjp/s13360-020-00365-0