Central exclusive quarkonium production with tagged forward protons at RHIC The KRYSTHAL Collaboration, L.A. Harland-Lang, V.A. Khoze, M.G. Ryskin and W.J. Stirling Eur. Phys. J. C, 71 2 (2011) 1545 Published online: 08 February 2011 DOI: 10.1140/epjc/s10052-011-1545-1