E. Moskaeva, K. Ostrovskiy, S. Shekhovtsov, and N. Mchedlov-Petrossyan, “Transmittance of electronic effects in the fluorescein molecule: nitro and amino groups in the phthalic acid residue”, Khark. Univ. Bull. Chem. Ser., no. 36, pp. 24-32, Feb. 2021.