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Ruiz de Elvira Carrascal, Jacobo; Meißner, U.-G.; Rusetsky, A.; Schierholz, G. (2017). Feynman–Hellmann theorem for resonances and the quest for QCD exotica. European physical journal. C - particles and fields, 77(10), p. 659. EDP Sciences 10.1140/epjc/s10052-017-5237-3
