1. Calvert, J.G. and Pitts, J.N., Jr, Photochemistry, New York: Wiley, 1966.
2. Prinsgheim, P., Z. Phys., 1923, vol. 16, no. 1, p. 71.
3. Terenin, A.N., Acta Phys.Ch. URSS, 1943, vol. 18, no. 3, p. 210.
4. Lewis, G.N. and Kasha, M., J. Am. Chem. Soc., 1944, vol. 66, no. 12, p. 2100.
5. Terenin, A.N., Fotokhimiya krasitelei (Photochemistry of Dyes), Moscow: Akad. Nauk SSSR, 1947.