Mahabub-Uz-Zaman, M., and Z. U. Ahmed. “Natural Transformation of Plasmid DNA in <i>Escherichia coli</i> In Sterilized Soil Column”. Bangladesh Journal of Microbiology, vol. 25, no. 1, Apr. 2010, pp. 49-52, doi:10.3329/bjm.v25i1.4856.