1. V. M. Abazov, V. Abramov, L. G. Afanasyev, R. R. Akhunzyanov, A. V. Akindinov, N. Akopov, I. G. Alekseev, A. M. Aleshko, V. Yu. Alexakhin, G. D. Alexeev, M. Alexeev, A. Amoroso, I. V. Anikin, V. F. Andreev, V. A. Anosov, A. B. Arbuzov, et al., arXiv: 2102.00442.
2. V. V. Abramov, A. Aleshko, V. A. Baskov, E. Boos, V. Bunichev, O. D. Dalkarov, R. El-Kholy, A. Galoyan, A. V. Guskov, V. T. Kim, E. Kokoulina, I. A. Koop, B. F. Kostenko, A. D. Kovalenko, V. P. Ladygin, A. B. Larionov, et al., Phys. Part. Nucl. 52, 1044 (2021); arXiv: 2102.08477.
3. A. Arbuzov, A. Bacchetta, M. Butenschoen, F. G. Celiberto, U. D’Alesio, M. Deka, I. Denisenko, M. G. Echevarria, A. Efremov, N. Ya. Ivanov, A. Guskov, A. Karpishkov, Ya. Klopot, B. A. Kniehl, A. Kotzinian, S. Kumano, et al., Prog. Part. Nucl. Phys. 119, 103858 (2021); arXiv: 2011.15005.
4. A. Mueller, in Proceedings of the 17th Rencontres de Moriond, Ed. by J. Tran Thanh Van (Ed. Front., Gif-sur-Yvette, France, 1982), Vol. 1, p. 13.
5. S. J. Brodsky, in Proceedings of the 13th International Symposium on Multiparticle Dynamics, Ed. by W. Kittel, W. Metzger, and A. Stergiou (World Scientific, Singapore, 1982), p. 963.