The generation mechanism of multiple-pole solutions for the fifth-order mKdV equation Zhao Zhang, Biao Li, Abdul-Majid Wazwaz and Qi Guo Eur. Phys. J. Plus, 137 2 (2022) 193 Published online: 02 February 2022 DOI: 10.1140/epjp/s13360-022-02412-4