Al-Rajhi, Shaymaa H., et al. “Purification and Characterization of Nitrate Reductase (NAR) from Pseudomonas Sp. SH7 Isolate”. Journal of Biotechnology Research Center, vol. 4, no. 2, June 2010, pp. 23-36, doi:10.24126/jobrc.2010.4.2.114.