Woo, H. S., Lhost, O., Graham, S. C., Bradley, D. D. C., Friend, R. H., Quattrocchi, C., et al. (1993). OPTICAL-SPECTRA AND EXCITATIONS IN PHENYLENE VINYLENE OLIGOMERS. Synthetic Metals, 59(1), 13-28. doi:10.1016/0379-6779(93)91153-S.