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Cross sections for the reactions e +e -→K +K -π +π -, K +K -π0π0, and K +K -K +K - measured using initial-state radiation events
Gershon, T. J..  Physical Review D (Particles, Fields, Gravitation and Cosmology).  v. Volume 86. no. Issue 1.   2012-05-26. p. 71 - issn: 1550-7998 .   

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