“SILICA GELS CHEMICALY MODEFIED BY TIOUREA AND AMINOTIOUREA GRUPS TO RECOVERY AND MESURING A TRACE AMOUNTS OF MERCURY: UDC 543.544 – 414.7: 54.05 + 543.272.81”. 2013. Bulletin of the Taras Shevchenko National University of Kyiv. Chemistry 49 (1): 24-26. https://chemistry.bulletin.knu.ua/article/view/8442.