1. Reshetnyak E.A., Shevcehnko V.N., Pastushkina I.O., Zagrevsky P.M., Bondarenko Y.A., Vlasova I.V., Ostrovskaya V.M. Separate sorption-spectroscopic determination of Pb(II), Mn(II), Co(II), Ni(II), Cd(II), Cu(II), Zn(II) in their mixture using the reagent indicator paper // V. N. Karazin Kharkiv National University Bulletin. Chemical series. 2013. № 22. C. 210-219.