Pariyapat Puengsawad; Chanitchote Piyapittayanun; Thornthan Sawangwan; 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. Agr. Nat. Resour. 2021, 55, 319–330.