Sutopo, W., Bahagia, S. N., Cakravastia, A., & Arisamadhi, T. (2013). A Buffer Stock Model to Ensure Price Stabilization and Availability of Seasonal Staple Foods under Free Trade Considerations. Journal of Engineering and Technological Sciences, 44(2), 128-148. https://doi.org/10.5614/itbj.eng.sci.2012.44.2.3