Rezanka, Tomas, and Andrea Palyzová. “Yeast Need Not Be Used Only in Beer Production. I. The Carotenoid Astaxanthin Produced by Yeast.”. KVASNÝ PRŮMYSL 66, no. 1 (January 22, 2020): 208–214. Accessed April 5, 2020. http://kvasnyprumysl.eu/index.php/kp/article/view/206.