TY JOUR TI Interaction of silicate minerals of various structure with ammonium hydrodifluoride KW fluoridation KW ammonium hydrodifluoride KW silicate minerals KW ammonium fluoride salts JO Technique and technology of silicates AU Nesterov, D.P. PY 2015 IS 22 PB Individual Entrepreneur Svetlana Vasilievna Samchenko