Abt, I., Adams, M., Agari, M., Albrecht, H., Aleksandrov, A., Amaral, V., et al. (2009). Production of the charmonium states chic1 and chic2 in proton nucleus interactions at sqrt(s)=41.6 GeV. Physical Review D, 79(1): 012001, pp. 1-18. doi:10.1103/PhysRevD.79.012001.