A. Pongpom, K. Bhaktikul, W. Wisawapipat, and P. Teartisup, “Spatial Distribution of Potentially Toxic Trace Elements of Agricultural Soils in the Lower Central Plain of Thailand after the 2011 Flood”, Environ. Nat. Resour. J., vol. 12, no. 1, pp. 68–79, Jun. 2014.