Sirisansaneeyakul, S., Songpim, M. and Vaithanomsat, P. 2012. Optimization of Inulinase, Invertase and β-fructofuranosidase Production from Aspergillus niger TISTR 3570 by the Taguchi Method. Agriculture and Natural Resources. 46, 2 (Apr. 2012), 238–255.