@article{articlec3e23728,
title   = {Air pollution and emergency room visits due to chronic lower respiratory diseases in the elderly: an ecological time-series study in São Paulo, Brazil},
author = {Martins, Lourdes Conceição and Latorre, Maria do Rosário Dias de Oliveira and Saldiva, Paulo Hilário Nascimento and Braga, Alfésio Luís Ferreira},
year = {2002},
journal   = {Journal of occupational and environmental medicine}
}