The spectral line asymmetry of the Doppler effect in relativistic plasmas H. Gossa, M. T. Meftah, K. Chenini, D. E. Zenkhri, B. Amieur and H. Guerrida EPL, 139 2 (2022) 20001 Published online: 27 July 2022 DOI: 10.1209/0295-5075/ac3d6d