Derrick, M. et al.(ZEUS Collaboration)M. et al.(ZEUS Collaboration)DerrickMIN-ZU WANG2018-09-102018-09-101993-11http://inspirehep.net/record/360338http://scholars.lib.ntu.edu.tw/handle/123456789/302539Observation of direct processes in photoproduction at HERAjournal article10.1016/0370-2693(94)91121-5