感兴趣的博友,请数下下面的论文,有多少作者,多少单位: Observation of hard scattering in photoproduction events with a large rapidity gap at HERA M. Derrick , D. Krakauer , S. Magill , B. Musgrave , J. Repond , J. Schlereth , R. Stanek , R.L. Talaga , J. Thron , F. Arzarello , R. Ayad , ...