Klimin, O. A., Y. A. Leykin, and T. A. Cherkasova. “Correlation Between PH of Medium and a Tint a Solid-Phase Indicator”. Sorbtsionnye I Khromatograficheskie Protsessy, Vol. 12, no. 5, Nov. 2019, https://journals.vsu.ru/sorpchrom/article/view/1860.