Adams, D.(1994). Measurement of the double-spin asymmetry A for inclusive multi-γ pair production with 200 GeV/c polarized proton beam and polarized proton target. Physics Letters B, 336(2), 269-274. doi:10.1016/0370-2693(94)00998-8

Adams, D.L. "Measurement of the Double-spin Asymmetry A for Inclusive Multi-γ Pair Production With 200 GeV/c Polarized Proton Beam and Polarized Proton Target". Physics Letters B, 336.2 ( 1994 ): 269-274.