A. V. Yudintsev, V. M. Trusova, G. P. Gorbenko, T. Deligeorgiev, A. Vasilev, and N. Gadjev, “Lanthanide effect on physicochemical properties of lipid bilayer as revealed by indicator dye bromothymol blue”, Bioph. Bull., vol. 1, no. 20, pp. 24-28, Jun. 2008.