Duarte-Moller, A., López, M.L., López, J.A., Durrer, M., Ramos, M.A., Sánchez-Santiago, P., 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. “Exelfs characterization of gold nanoparticles, produced by esterified hop biomass deposited on Si substrates by the spray pyrolysis technique”, published in the CD of the proceedings of the SAMPE 2004, May 16-20, 2004, Long Beach Convention Center, Long Beach, CA, 7 pages. 2004.