Nyakuma, Bemgba B., et al. “Carbon Dioxide-Assisted Torrefaction of Maize Cobs by Thermogravimetry: Product Yield and Energy Recovery Potentials”. Physics and Chemistry of Solid State, vol. 23, no. 1, Jan. 2022, pp. 16-24, doi:10.15330/pcss.23.1.16-24.