Zlobina, Yelena, and A. Toktassinova. “Improvement of Chemical Preparation of Geological Samples for Determination of Gold”. Chemical Bulletin of Kazakh National University 70, no. 2 (May 14, 2013): 119-125. Accessed April 26, 2024. https://bulletin.chemistry.kz/index.php/kaznu/article/view/136.