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Bečirević, Damir; Duplančić, Goran; Klajn, Bruno; Melić, Blaženka; Sanfilippo, Francesco (2014) Lattice QCD and QCD sum rule determination of the decay constants of ηc, J/ψ and hc states. Nuclear Physics B, 883 . pp. 306-327. ISSN 0550-3213