2014. COLORIMETRIC DETERMINATION OF PD(II), RH(III), RU(IV) ON THE SURFACE OF SILICA GEL CHEMICALLY MODIFIED WITH THIOUREA GROUPS: UDC 543.4:54.412.2.544.723–546.9. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry. 50, 1 (Nov. 2014), 41–43.