S. Usenko, Simonich, S. L. Massey, Hageman, K. J., Schrlau, J., Geiser, L., Campbell, D. H., Appleby, P. G., and Landers, D. H.,
“Sources and Deposition of Polycyclic Aromatic Hydrocarbons to Western U.S. National Parks”,
Environmental Science & Technology, vol. 44, no. 12, pp. 4512 - 4518, 2010.