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Adolph, C.; Akhunzyanov, R.; Alexeev, M.G.; Alexeev, G.D.; Amoroso, A.; Andrieux, V.; et al. (2015). "Odd and even partial waves of ηπ− and η′π− in π−p → η(′)π−p at 191 GeV/c2". Physics Letters B. 740: 303–311. arXiv:1408.4286. doi:10.1016/j.physletb.2014.11.058.