Belko, Nikita V., et al. “Spectrophotometrical Purity and Stability Testing of a Photosensitizer Based on an Indotricarbocyanine Dye”. Journal of the Belarusian State University. Physics, no. 3, Oct. 2020, pp. 17-23, https://doi.org/10.33581/2520-2243-2020-3-17-23.