Association between air pollution and mortality due to respiratory diseases in children in Sao Paulo, Brazil: a preliminary report - Saldiva, Paulo Hilário Nascimento; Lichtenfels, Ana Julia de Faria Coimbra; Paiva, Paulo S de Oliveira; Barone, I A; Martins, Milton Arruda; Massad, Eduardo; Pereira, Júlio César Rodrigues; Xavier, V P; Singer, Júlio da Motta; Bohm, Gyorgy (Environmental Research, 1994)