DILENDRA CHANDRAKER, SHWETA SAO, YOGESH KUMAR DESHMUKH, LEENA VERMA, and PANKAJ K. SAHU, “ISOLATION OF Aspergillus niger FROM Allium cepa BULB AND PRODUCTION OF CITRIC ACID FROM IT”, ijpbs, vol. 5, no. 1, pp. 144–147, Mar. 2014.