Ansanay, Y., P. Kolar, R. Sharma-Shivappa, J. Cheng, S. Park, and C. Arellano. “Pre-Treatment of Biomasses Using Magnetised Sulfonic Acid Catalysts”. Journal of Agricultural Engineering, vol. 48, no. 2, June 2017, pp. 117-22, doi:10.4081/jae.2017.594.