“COMPARISON OF HYPER PRODUCER ASPERGILLUS NIGER CULTURES (IFS-5, IFS-6 AND IFS-17) FOR CITRIC ACID FERMENTATION IN SURFACE CULTURE: Short Communication”. 2004. Biological Sciences - PJSIR 47 (5): 403-5. https://www.v2.pjsir.org/index.php/biological-sciences/article/view/1560.