Ablikim, M. et al.M. et al.AblikimMIN-ZU WANG2018-09-102018-09-102014-11http://inspirehep.net/record/1329785http://scholars.lib.ntu.edu.tw/handle/123456789/386152[SDGs]SDG7Evidence for $e^+e^-\\to\\gamma\\chi_{c1, 2}$ at center-of-mass energies from 4.009 to 4.360 GeVjournal article10.1088/1674-1137/39/4/041001