1. Gouterman, M., J. Mol. Spectrosc., 1961, vol. 6, no. 4, p. 138.
2. Kuz’mitskii, V.A., Solov’ev, K.N., and Tsvirko, M.P., Porfiriny: spektroskopiya, elektrokhimiya, primenenie (Porphyrins: Spectroscopy, Electrochemistry, and Applications), Enikolopyan, N.S., Ed., Moscow: Nauka, 1987, p. 7.
3. Gaspard, S., Verdaquer, M., and Viovi, R., J. Chem. Res. M., 1979, no. 12, p. 3072.
4. Bernstein, P.A. and Lever, A.B.P., Inorg. Chim. Acta, 1992, vols. 198–200, no. 3, p. 243.
5. Stuzhin, P.A., Khelevina, O.G., and Berezin, B.D., Phthalocyanines: Properties and Applications, Leznoff, C.C. and Lever, A.B.P., Eds., New York: VCH, 1996, vol. 4, p. 19.