Sevryukova, M.M., et al. “Cyanine-Like and Polyenic Relaxation Paths of Merocyanine Derivatives of Malonodinitrile in the Excited State Detecting by Low Temperature Time-Resolved Fluorescence”. Ukrainian Journal of Physics, vol. 57, no. 8, Aug. 2012, p. 812, doi:10.15407/ujpe57.8.812.