Tatykaev, Batukhan, and Galina Abramova. “Study of Reduction of Chromium (VI) by Calcium Polysulfide Using Spectrophotometric Method”. Chemical Bulletin of Kazakh National University 69, no. 1 (May 14, 2013): 64-69. Accessed November 24, 2024. https://chemistry.kz/bulletin/index.php/kaznu/article/view/10.