Sangsurasak, P., T. Srinophakhun, and D. A. Mitchell. “Mathematical Modelling Development of Packed Bed Bioreactors in Solid-State Fermentation”. Agriculture and Natural Resources, vol. 31, no. 4, Dec. 1997, pp. 452-8, https://li01.tci-thaijo.org/index.php/anres/article/view/241008.