Guo, Pei-yong, et al. “Spatial Distributions and Environmental Significance of Nitrogen in Sediments of Two Typical Urban Shallow Lakes in Southern Fujian, P.R. China”. Asian Journal of Chemistry, vol. 24, no. 2, Nov. 2011, pp. 615-20, https://asianpubs.org/index.php/ajchem/article/view/8630.