Singh, Surendra, and Nisha Tiwari. 2020. “Impact of Sodium Nitrate on Astaxanthin Production in Green Micro- Alga Haematococcus Pluvialis under Laboratory Condition”. International Journal of Scientific Research in Biological Sciences 7 (2):120-22. https://ijsrbs.isroset.org/index.php/j/article/view/348.