Evidence of critical dynamics in various electromagnetic precursors S.M. Potirakis, Y. Contoyiannis, A. Schekotov, K. Eftaxias and M. Hayakawa Eur. Phys. J. Special Topics, 230 1 (2021) 151-177 Published online: 19 January 2021 DOI: 10.1140/epjst/e2020-000249-x