L. . Kawsakul, 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”, Agr. Nat. Resour., vol. 46, no. 4, pp. 573–581, Aug. 2012.