Nadeem, A. N., Jafri, S. A., Baig, S., Irfan, M. and Syed, Q. (2009) “Short Communication Optimization of Substrate Concentration for Enhanced Citric Acid Production by Aspergillus niger M-101: Short Communication: Citric Acid Production by A. niger”, Biological Sciences - PJSIR, 52(5), pp. 275–277. Available at: https://v2.pjsir.org/index.php/biological-sciences/article/view/564 (Accessed: 8 May 2024).