Pariyapat Puengsawad, Chanitchote Piyapittayanun, Thornthan Sawangwan, and Sudathip Chantorn. “Characterization of Bacillus Subtilis GA2(1) Mannanase Expressed in Escherichia Coli Rosetta (DE3) for Enzymatic Production of Manno-Oligosaccharides from Spent Coffee Grounds and in Vitro Assessment of Their Prebiotic Properties”. Agriculture and Natural Resources, vol. 55, no. 3, June 2021, pp. 319–330, https://li01.tci-thaijo.org/index.php/anres/article/view/251400.