Phimchanok Nakkharat, Arkom Tesnum, Arkira Maethawarakorn, Dietmar Haltrich, & Chirakarn Muangnapoh. (2008). Characterization of a Crude Thermostable β-galactosidase by the Bacterium PD1 Isolated from the Pong Dueat Hot Spring. Agriculture and Natural Resources, 42(5), 264–268. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/244605