“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, vol. 3, no. 1, June 2024, pp. 51-60, https://doi.org/10.61363/fsamr.v3i1.146.