Naumenko, A. P.; Borysuk, V. I.; Iakhnenko, M. S.; Gubanov, V. O.; Slominskii, Y. L.; Kachkovsky, O. D. Probing of Higher Excited States of Merocyanine Derivatives of Azaazulene and Indandione by Fluorescence Excitation Anisotropy Spectra. Ukr. J. Phys. 2020, 65, 321.