Bhatnagar, D., et al. “Amylase and Acid Protease Production by Solid State Fermentation Using Aspergillus Niger from Mangrove Swamp”. Indian Journal of Fisheries, vol. 57, no. 1, July 2011, pp. 45-51, https://epubs.icar.org.in/index.php/IJF/article/view/7522.