Tharek, A.; Yahya, A.; Salleh, M. M.; Jamaluddin, H.; Yoshizaki, S.; Dolah, R.; Hara, H.; Iwamoto, K.; Mohamad, S. E. Improvement of Astaxanthin Production in Coelastrum Sp. By Optimization Using Taguchi Method. Appl Food Biotechnol 2020, 7, 205-214.