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N. Chanchay and  S. Sirisansaneeyakul and  C. Chaiyasut and  N. Poosaran,  Optimal Conditions for Carotenoid Production and Antioxidation Characteristics by Rhodotorula rubra.   journal   = {International Journal of Biological, Biomolecular, Agricultural, Food and Biotechnological Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 621 - 625[viewed 24 October 2018]. Available from: http://waset.org/publications/5967.