1. A. V. Chernyshev, I. V. Dorogan, N. A. Voloshin, A. V. Metelitsa, V. I. Minkin, Izv. Akad. Nauk, Ser. Khim., 2011, 447 [Russ. Chem. Bull., Int. Ed., 2011, 60, 456].
2. R. C. Bertelson, in Organic Photochromic and Thermochromic Compounds. Topics in Applied Chemistry, Eds J. C. Crano, R. J. Guglielmetti, Plenum Press, New York, 1999, Vol. 1, p. 11.
3. V. I. Minkin, Chem. Rev., 2004, 104, 2751.
4. B. S. Luk’yanov, M. B. Luk’yanova, Khim. Geterotsikl. Soedin., 2005, 321 [Chem. Heterocycl. Compd. (Engl. Transl.), 2005, No. 3].
5. V. A. Barachevsky, Yu. P. Strokach, Yu. A. Puankov, O. I. Kobeleva, T. M. Valova, K. S. Levchenko, V. N. Yarovenko, M. M. Krayushkin, ARKIVOC, 2009, 9, 70.