1. Turro, N. J. 1978.Modern Molecular Photochemistry, 107Menlo Park, California: The Benjamin / Cummings Publishing.
2. Ohshima, S., Uchida, A., Oonishi, I. and Fujisawa, S. The 16th International Simposium on Polycyclic Aromatic Compounds. pp.A-18Charlotte in Figure 1 of this reference, the structure of compounds 1 and 2 was reversed
3. Polarizations and assignments of transitions: The method of photoselection