Photochromic crown ethers 1. Formation of ion pairs, trans - cis-isomerization, and metal ion binding in a nonpolar medium / V.P. Tsybyshev, V.A. Livshits, B.B. Meshkov, O.A. Fedorova, S.P. Gromov, M.V. Alfimov // Russian Chemical Bulletin. – 1997. – Т. 46. – № 7. – P. 1239-1244
