Nunkaew, T., and P. Kaewmeesri. “Production and antioxidant activities of Exopolymeric substances from phototrophic purple non-sulfur bacteria Rhodopseudomonas palustris PP803”. Health Science, Science and Technology Reviews, vol. 13, no. 3, Dec. 2020, pp. 29-42, https://li01.tci-thaijo.org/index.php/journalup/article/view/246808.