Ground and excited state charmonium production in p þ p collisions at ffiffiffis p ¼ 200 GeV - Adare, A; Dietzsch, Olácio; Donadelli, Marisilvia; Leite, Marco Aurelio Lisboa; Lenzi, B; Silva, Cesar Luiz da; Takagui, Emi Márcia (Physical Review D, 2012)