Benjaporn Boonyapookana. (2000) Toxicity and biosorption of chromium and cadmium by using duckweed Wolffia globosa Hartog & Plas. Mahidol University,:ม.ป.ท.Benjaporn Boonyapookana. 2000. Toxicity and biosorption of chromium and cadmium by using duckweed Wolffia globosa Hartog & Plas. ม.ป.ท.:Mahidol University,;Benjaporn Boonyapookana. Toxicity and biosorption of chromium and cadmium by using duckweed Wolffia globosa Hartog & Plas. ม.ป.ท.:Mahidol University, 2000. Print.