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J. Sunyer, C. Spix, P. Quénel, A. Ponce-de-León, A. P?nka, T. Barumandzadeh, G. Touloumi, L. Bacharova, B. Wojtyniak, J. Vonk, L. Bisanti, J. Schwartz, K. Katsouyanni, “Urban air pollution and emergency admissions for asthma in four European cities: the APHEA project,” Thorax, Vol. 52, 1997, pp. 760-765. doi:10.1136/thx.52.9.760

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