Rohlfing, F., Bradley, D. D. C., Eberhardt, A., Müllen, K., Cornil, J., Beljonne, D., et al. (1996).
Electroabsorption spectroscopy of beta-carotene and alpha omega-bis(1,1-dimethylheptyl)-1,3,5,7,9,11,13,15-hexadecaoctaene. Synthetic Metals, 76(1-3), 35-38. doi:10.1016/0379-6779(95)03414-F.