Energy exchange in M-crowdion clusters in 2D Morse lattice Igor A. Shepelev, Dmitry V. Bachurin, Elena A. Korznikova and Sergey V. Dmitriev Eur. Phys. J. B, 93 9 (2020) 167 Published online: 02 September 2020 DOI: 10.1140/epjb/e2020-10160-0