@article{Schwartz1992,
author = {Schwartz, J. and Dockery, D.W.},
title= {Increased mortality in Philadelphia associated with daily air pollution concentrations},
year = {1992},
doi = {10.1164/ajrccm/145.3.600},
journal = {American Review of Respiratory Disease },
volume = {145},
number = {3},
pages = {600--604},
}