Parsons, J.G., Peralta-Videa, J.R., Tiemann, K.J., Saupe, G.B., Gardea-Torresdey, J.L.. . The Study of PM10 and Heavy Metal Concentrations in Environmental Air Samples of Chihuahua City, Mexico. Ciencia en la Frontera, V, 5058. Use of chemical modification and spectroscopic techniques to determine the binding and coordination of Gadolinium(III) and Neodymium(III) ions by alfalfa biomass. Talanta 67(1), 34-45. 2005.