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Y. E. Choi; Y.-S. Yun; J. M. Park. (2002). Evaluation of Factors Promoting Astaxanthin Production by a Unicellular Green Alga, <em>Haematococcus pluvialis</em>, with Fractional Factorial Design. , 18(6), 1170–1175. doi:10.1021/bp025549b 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research