Kawsakul, L., W. Yongmanitchai, and D. Chonudomkul. “Optimization of Growth and Production of Docosahexaenoic Acid by Schizochytrium limacinum BR2.1.2 Using Plackett-Burman Design and Central Composite Design with Response Surface Methodology”. Agriculture and Natural Resources, vol. 46, no. 4, Aug. 2012, pp. 573-81, https://li01.tci-thaijo.org/index.php/anres/article/view/242911.