Intaratrakul, K., S. Nitisinpraserta, and S. Keawsompong. “Effect of Culture Condition on High-Level Expression of Recombinant β-Mannanase from Bacillus Circulans NT 6.7 in Escherichia Coli and Application in Mannan Hydrolysis”. Agriculture and Natural Resources, vol. 53, no. 3, June 2019, pp. 314-9, https://li01.tci-thaijo.org/index.php/anres/article/view/229896.