@article {3783,
	title = {Critique of "Precipitation in Light Extinction Reconstruction" by P.A. Ryan},
	journal = {Journal of the Air \& Waste Management Association},
	volume = {56},
	year = {2006},
	month = {May},
	pages = {539-546},
	keywords = {Acid rain, Air particles, Visibility},
	url = {http://www.environmental-expert.com/Files\%5C6477\%5Carticles\%5C6608\%5Cschichtel.pdf},
	author = {Schichtel, Bret A and Malm, William C and Pitchford, Marc L}
}
