@article{Cleveland1979,
author = {Cleveland, W.S. and Graedel, T.E.},
title= {Photochemical air pollution in the northeast United States},
year = {1979},
doi = {10.1126/science.204.4399.1273},
journal = {Science},
volume = {204},
number = {4399},
pages = {1273--1278},
}