“SORPTION - PHOTOMETRIC DETERMINATION OF THE COMPLEXES OF THE METAL SALTS OF Cu, Cd, Co, Mn FORMED WITH GOSSYPOL SCHIFF BASES”. Scientific Journal of the Fergana State University, vol. 28, no. 5, July 2023, p. 56, https://journal.fdu.uz/index.php/sjfsu/article/view/2123.