Bac, V.H., Thu Hang, D.T., Tai, L.T. and Truong, L.V. 2013. High level expression of a gene coding for pectate lyase in Bacillus subtilis 168. Academia Journal of Biology. 35, 3 (Oct. 2013), 369–375. DOI:https://doi.org/10.15625/0866-7160/v35n3.3393.