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. FSAMR [Internet]. 2024 Jun. 12 [cited 2024 Nov. 22];3(1):51-60. Available from: http://finessepublishing.com/index.php/fsamr/article/view/146