From soft photon study at Nuclotron and U-70 to NICA - Soft photons E. Ardashev, V. Avdeichikov, V. Balandin, G. Bogdanova, V. Dunin, O. Gavrishchuk, V. Golovkin, S. Golovnya, S. Gorokhov, A. Isupov et al. (22 more) Eur. Phys. J. A, 52 8 (2016) 261 Published online: 24 August 2016 DOI: 10.1140/epja/i2016-16261-4