The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisionsSergey Baranov, Anna Cisek, Mariola Kłusek-Gawenda, Wolfgang Schäfer and Antoni SzczurekEur. Phys. J. C, 73 2 (2013) 2335DOI: https://doi.org/10.1140/epjc/s10052-013-2335-8