Muanmai Apinthanapong, and Mongkol Phensaijai. “Biosorption of Copper by Spent Yeast Immobilized in Sodium Alginate Beads”. Agriculture and Natural Resources, vol. 43, no. 5, Dec. 2009, pp. 326-32, https://li01.tci-thaijo.org/index.php/anres/article/view/244836.