Sompron Choonluchanon, Bunharn Tangcham, & Jirayuth Tunveenukul. (1996). Effects of EM on the Growth and Nitrogen Fixation Efficiency of Blue Green algae. Agriculture and Natural Resources, 30(5), 159–164. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/241261