“Influence of Nitrogen Concentration on the C-Phycocyanin Production of Spirulina Platensis (Gomont) Geitler”. PUP Journal of Science and Technology 13, no. 1 (March 11, 2023): 1–9. Accessed April 3, 2025. https://publishing.pup.edu.ph/ojs/index.php/PUP-JST/article/view/34.