Probing unparticle theory via lepton-flavor violating process J/ψ→ll′ at BESIIIZheng-Tao Wei, Ye Xu and Xue-Qian LiEur. Phys. J. C, 62 3 (2009) 593-598DOI: https://doi.org/10.1140/epjc/s10052-009-1071-6