Spiropyran analogs of retinal: Synthesis and study of their photochromic properties / A.V. Laptev, N.E. Belikov, A.Y. Lukin, V.I. Shvets, A.A. Khodonov, V.A. Barachevskii, M.V. Alfimov, O.V. Demina, S.D. Varfolomeev // High Energy Chemistry. – 2008. – Т. 42. – № 7. – P. 601-603
