Lu, Y., and X. Zhang. “The Upstream Sequence of the Phycocyanin β Subunit Gene from Arthrospira Platensis Regulates Expression of Gfp Gene in Response to Light Intensity”. Electronic Journal of Biotechnology, vol. 8, no. 1, Apr. 2005, pp. 0-0, https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v8n1-9.