Okotubu, W. .; Okotubu, B. .; Obanla, I. .; Adebisi, N. .; Ikwuoche, E. .; Okoro, L. OPTIMIZATION PRODUCTION OF CITRIC ACID BY Aspergillus Niger THROUGH SUBMERGED FERMENTATION OF DRIED ORANGE PEELS FROM GONIN-GORA, CHIKUN L.G.A., KADUNA STATE, NIGERIA . JCSN 2025, 50.