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Search for the Z_{1}(4050)^{+} and Z_{2}(4250)^{+} states in B[over ¯]^{0}→χ_{c1}K^{-}π^{+} and B^{+}→χ_{c1}K_{S}^{0}π^{+}
Gershon, T. J..  Physical Review D (Particles, Fields, Gravitation and Cosmology).  v. Volume 85. no. Number 5.   2012-03. p. 11 - issn: 1550-7998 .   

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