“ADSORPTION PROPERTIES OF SILICAS WITH COVALENTLY ATTACHED COMPLEXING GROUPS TOWARDS Zn(ІІ), Hg(ІІ), Fe(ІІІ), Cu(ІІ), Cd(ІІ) AND Pb(ІІ) IONS: UDC 543.43:546.45”. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry, vol. 48, no. 1, Sept. 2010, pp. 15-18, https://chemistry.bulletin.knu.ua/article/view/8306.