THE EFFECT OF COFFEE LEATHER FERMENTATION BY Aspergillus niger WITH THE ADDITION OF TWO VARIATIONS OF THE CONCENTRATION OF UREA AND AMMONIUM SULPHATE USING TWO FERMENTATION TECHNIQUES ON CRUDE FIBER. JPS [Internet]. 2022 Jul. 30 [cited 2026 Oct. 21];5(2):156-69. Available from: https://journal-jps.com/new/index.php/jps/article/view/2123