“Citric Acid Production by the Solid-State Fermentation Potential Of  Aspergillus Niger Using Different Substrate Wheat Straw, Sugarcane Waste and Mixed from North Gondar Area of Ethiopia”. Food Science & Applied Microbiology Reports 3, no. 1 (June 12, 2024): 51–60. Accessed November 22, 2024. http://finessepublishing.com/index.php/fsamr/article/view/146.