Fiana, R.M. et al. 2013. Effect of Fermentation Time and Calcium Nitrate Concentration on Enzyme Glucoamylase Production of Gliocladium KE Using Sago Hampas Solid Substrate. International Journal on Advanced Science, Engineering and Information Technology. 3, 3 (Jun. 2013), 191–194. DOI:https://doi.org/10.18517/ijaseit.3.3.318.