An association between air pollution and mortality in six U.S. cities.
Dockery DW; Pope CA 3rd; Xu X; Spengler JD; Ware JH; Fay ME; Ferris BG Jr; Speizer FE; The New England Journal Of Medicine, 1993, vol. 329, issue 24, p 1753, ISSN 00284793. ISBN 00284793.
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