Adhikary, Bishnu Hari, Somsak Vangnai, Tasnee Attanandana, Prayoon Swatdee, and Prapa Sripichitt. “Growth and Nitrogen Production Rates of Azolla ( Azolla microphylla ) as Affected by Its Cultivation Methods : An Economic Perspective in Rice Cultivation in Thailand”. Agriculture and Natural Resources 31, no. 1 (March 31, 1997): 134–140. accessed September 17, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/240797.