Fron, E., Schweitzer, G., Jacob, J., Van Vooren, A., Beljonne, D., Müllen, K., et al. (2007). Singlet-singlet annihilation leading to a charge-transfer intermediate in chromophore-end-capped pentaphenylenes. ChemPhysChem, 8(9), 1386-1393. doi:10.1002/cphc.200700136.