Twisted lump, lumpoff and rogue wave of the (2+1)-dimensional Kaup–Kupershmidt equation Junchao Chen, Ji Lin and Senyue Lou Eur. Phys. J. Plus, 135 3 (2020) 287 Published online: 06 March 2020 DOI: 10.1140/epjp/s13360-020-00300-3