Hovhannisyan, G. R. “STUDY OF SILICA GEL HYDROXYL COVERAGE, OBTAINED FROM SERPENTINITS ”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 43, no. 1 (218), Mar. 2009, pp. 3-8, doi:10.46991/PYSU:B/2009.43.1.003.