Observation of J/[psi]-pair production in pp collisions at √s=7TeV - Aaij, Roel; Bachmann, Sebastian; Bien, Alexander; Blouw, Johan; Deissenroth, Marc; Eisele, Franz; Färber, Christian; Gersabeck, Evelina; Hansmann-Menzemer, Stephanie; Holubyev, Kostya; Jäger, Andreas; Kreplin, Katharina; et al. (Physics letters, 2012)