N. GHOSH, S. GANGULY, and A. K. BANIK. “Comparison Of Microbial Humic Acid Produced By Aspergillus Niger X1 And Soil Humic Acid”. International Journal of Pharma and Bio Sciences 2, no. 2` (March 31, 2011): 479–484. Accessed July 23, 2026. https://ijpbs.net/index.php/journal/article/view/853.